• Reflexive grasp at birth; pre-reaching is present but ineffective. — Eliot, What's Going On in There?

• Touch is "one of a baby's most advanced abilities at birth." — Eliot, What's Going On in There?
• Smell is already functional — newborns prefer their mother's unwashed breast and can identify their own mother by smell. — Eliot, What's Going On in There?
• Taste is innate: newborns love sweet, reject sour/bitter, are indifferent to salt. — Eliot, What's Going On in There?
• Hearing is well-developed at birth — babies have about twelve weeks of prenatal listening experience, recognize their mother's voice, and prefer the higher-pitched, singsong "motherese." — Eliot, What's Going On in There?
• The vestibular system (balance/motion) is the first fiber tract in the brain to myelinate, fully sized by five months gestation — babies crave rocking and bouncing. — Eliot, What's Going On in There?
• Vision is the most immature at birth (~20/600 acuity, ~8-inch focus). — Eliot, What's Going On in There?
• Touch is the earliest-developing and most fundamental sense; the skin is a baby's "first language" of communication, and tactile stimulation speeds myelination of the brain and nervous system. — McClure, Infant Massage
• Newborns have no body clock (circadian rhythm) — they don't sleep only at night — and spend much more time in Active sleep, the infant equivalent of REM, with shorter sleep cycles than adults. — Ball, How Babies Sleep

• Communication is through cries, facial expressions, and states of alertness. The earliest foundation of emotional intelligence begins here. — Eliot, What's Going On in There?
• Newborns imitate facial expressions from birth — stick out your tongue and a newborn sticks out theirs; the youngest tested was 42 minutes old. Imitation implies babies map their own internal body sense onto the face they see, recognizing that other people are "like me." — Gopnik, Meltzoff & Kuhl, The Scientist in the Crib

• Parent and baby begin finding a shared rhythm, "like dancers learning through practice to coordinate their actions." Both mothers and fathers undergo hormonal brain changes fueled by oxytocin; fathers who were primary caregivers show their own hormonal brain changes from caring early. Hospitals now encourage daddy-baby skin-on-skin bonding right after birth. — Delahooke, Brain-Body Parenting
• A newborn emerges with "a powerful instinct to be close to you. Not just any adult will do" — even with blurry vision, a baby senses the parent's love and devotion. This is the person the baby intuits will be here for them. — Hoffman, Cooper & Powell, Raising a Secure Child
• Practice responsive parenting: observe the baby's cues (e.g., yawning, rubbing eyes), accurately interpret them (the baby is tired), and take action to meet the need (put the baby down for a nap). Responsive parents raise babies who sleep better, are less fearful, and experience less stress in their bodies. — Delahooke, Brain-Body Parenting
• Build attachment through caregiving routines — narrate what you're going to do, move slowly and gently. In the beginning "the hands are everything for an infant. The hands are the person, the world." (Pikler) — Gerber, Your Self-Confident Baby
• Placed skin-to-skin after birth, newborns autonomously progress through Widström's 9 stages (birth cry, rest, awakening, crawling up the mother's body, finding and suckling the breast, then sleeping) — "a built-in mission." — Ball, How Babies Sleep

• Cohen's foundational pattern is cellular breathing — the baseline of all movement, correlating to the movement of one-celled animals. — Cohen, Sensing, Feeling, and Action
• Babies are born neurologically ~3 months early — a "fourth trimester." Had delivery been delayed three more months, the baby would arrive already able to smile, coo, and flirt; newborns are "more a fetus than an infant." — Karp, The Happiest Baby on the Block
• Sleep serves rapid brain growth — babies' brains create neural pathways at a phenomenal rate through the first year, driving the rapid increase in brain size to age one. — Ball, How Babies Sleep
• Babies' attention is broad and diffuse — a "lantern" — versus adults' focused "spotlight"; babies seem aware of more, more intensely, than adults. — Gopnik, The Philosophical Baby

• Newborns have no circadian rhythm (body clock). They spend ~50% of sleep in Active sleep (the infant equivalent of REM), with short ultradian cycles of ~45–60 minutes. Sleep is distributed across the full 24-hour day. — Ball, How Babies Sleep

• Newborns feed frequently — about 8–12 times in 24 hours — because breastmilk is rapidly digested and newborn stomach capacity is tiny (cherry-sized at birth, grape-sized by day 3). — Douglas, The Discontented Little Baby Book
• Cluster feeding (frequent feeds clustered in one part of the day) is normal and supports milk supply. — Ball, How Babies Sleep
• Responsive, cued feeding — following the baby's hunger signals rather than a clock — meets both nutritional and comfort needs. — Douglas, The Discontented Little Baby Book

• Skin-to-skin / kangaroo care aids breastfeeding and weight gain. Infant massage (Tiffany Field–style) shows faster weight gain and better novelty preference. Responsive, cued feeding. Hold, carry, rock. — Eliot, What's Going On in There?
• Provide vestibular stimulation through rocking, front packs, waterbeds for premies. — Eliot, What's Going On in There?
• Practice the three steps of responsive parenting: observe the baby's cues (yawning, rubbing eyes), interpret what they mean (tired, hungry), and act to meet the need. "The best thing you can do for your baby is to lovingly observe their cues, interpret what they mean, and then take action to meet those needs." — Delahooke, Brain-Body Parenting
• Give a newborn a quiet, unstimulated transition — life itself provides enough natural stimulation. Trust that she will develop "in her own time, rhythm, and manner" rather than shaking rattles or using flashcards. — Gerber, Your Self-Confident Baby
• Soothe by imitating the womb to trigger an innate "calming reflex," via the 5 S's (Swaddle, Side/Stomach, Shush, Swing, Suck), layered together as the "Cuddle Cure." — Karp, The Happiest Baby on the Block

• Holds head erect and steady (1–2 months). — Eliot, What's Going On in There?
• Lifts head and chest with arm support on tummy (2–3 months). — Eliot, What's Going On in There?
• Sits with support (2–3 months). — Eliot, What's Going On in There?

• Social smiling emerges around six weeks of age (range 4–8 weeks) — "probably the most universal of all developmental milestones." It is driven by the basal ganglia (which mature before the motor cortex), so a baby's first social smiles are genuine. — Eliot, What's Going On in There?
• Protoconversation — face-to-face, turn-taking vocal exchange — begins around six weeks and continues until three or four months. Researchers call it "prespeech." — Eliot, What's Going On in There?

• The first social smiles (~6 weeks) are the beginning of reciprocal attachment — the baby's smile hooks the parent, and the parent's smile reinforces the baby. The basal ganglia drive these smiles, so they are genuine. — Eliot, What's Going On in There?
• Protoconversation (~6 weeks) — face-to-face, turn-taking vocal exchange — is itself an attachment behavior. Researchers call it "prespeech"; it establishes the back-and-forth rhythm of human relationship. — Eliot, What's Going On in There?
• Meet the baby's needs for nutrition, safety, and security consistently, especially in the first six months. "The way to help a baby move toward self-regulation as a child is first to co-regulate with consistency." — Delahooke, Brain-Body Parenting

• Self-settling isn't a skill you must teach — it matures on its own over the first year or two as a biologically normal process. Regular night-waking in the first year of life is not a problem to be fixed. — Douglas, The Discontented Little Baby Book

• Sleep patterns remain fragmented; day and night are still blurred. Active sleep still predominates. Sleep duration is highly variable — 9 to 20 hours per day in newborns, with up to 12-hour day-to-day swings. — Douglas, The Discontented Little Baby Book

• Growth spurts drive increased feeding frequency. Feeding on demand continues to support supply and growth. — Douglas, The Discontented Little Baby Book
• Cued bottle-feeding — using a slow-flow teat, holding the bottle horizontally, pacing with breaks, and swapping sides — mimics the responsive rhythm of breastfeeding and lets the baby regulate intake. — Douglas, The Discontented Little Baby Book

• What changes: The baby’s senses grow rapidly — longer focus distance, more alert time, increased crying and whimpering as the baby processes more sensory input.
• Fussy phase: Lasts about 1 day to 1 week. The baby may cry more, be harder to soothe, and seem generally unsettled.
• How to support: Extra cuddling, physical contact, and responsive nursing or feeding. Provide a calm, low-stimulation environment during the fussy phase.
• Note: Leap timing is approximate and varies per baby. This is not a diagnostic schedule. — van de Rijt & Plooij, The Wonder Weeks

• Face-to-face talking, eye contact, and responsive vocal turn-taking. — Eliot, What's Going On in There?
• Tummy time — because back-sleeping (to prevent SIDS) modestly delays motor milestones, give supervised prone play. — Eliot, What's Going On in There?
• Rock, bounce, and sway to engage the vestibular system. — Eliot, What's Going On in There?
• Connect during the “quiet alert” state — when your baby’s eyes are bright and focused on you, breathing is regular, and the body is relaxed. This is when nurtured connection (eye contact, touch, interaction, back-and-forth) builds the brain’s self-regulation circuits. “You have to enter their world, be present and engaged.” — Kirshenbaum, The Nurture Revolution
• Massage stimulates the gastrointestinal system and is a tool for the "colicky" baby (colic tends to peak around six weeks). — McClure, Infant Massage

• Voluntary grasp emerges (~3 months); pre-reaching subsides as reaches become intentional. — Eliot, What's Going On in There?
• Rolls tummy to back (3–4 months). — Eliot, What's Going On in There?

• Vision improves steadily; binocular stereo depth has its sudden onset around 3.5 months. — Eliot, What's Going On in There?

• In the "quiet alert" state (eyes bright and shiny, breathing regular, body relaxed), babies initiate connection through eye contact, smiling, and vocalizing — they are reaching out for attention. Connection in this state grows inhibitory neural connections from the thinking brain to the amygdala, building circuits for self-regulation and faster stress recovery. — Kirshenbaum, The Nurture Revolution
• Nurtured connection requires eye contact, touch, interaction, and participation from both parent and baby — not just proximity. "You have to enter their world, be present and engaged." Quality matters more than quantity. — Kirshenbaum, The Nurture Revolution
• You are the architect of your baby's experience. Every interaction creates memories that help the baby feel the world is "a safe and trustworthy place." You won't always read the baby accurately; the key is observing and adjusting based on the baby's feedback. — Delahooke, Brain-Body Parenting

• The prevertebrate patterns — navel radiation (relating and movement of all parts of the body via the navel), mouthing, and pre-spinal movement — are the last patterns before the vertebrate sequence begins. — Cohen, Sensing, Feeling, and Action
• Development proceeds "growing down" — myelination moves top-to-bottom, so the mouth, eyes, arms, and hands come under control before the legs and feet. — Baldwin Dancy, You Are Your Child's First Teacher

• The circadian clock begins to organize, aided by daylight exposure and daily routines — the suprachiasmatic nucleus responds to light as a zeitgeber. Night sleep stretches may lengthen, but variability is normal. — Ball, How Babies Sleep

• Feeding rhythms become somewhat more predictable as the baby's stomach capacity grows and the parent-baby dyad finds its groove. Responsive feeding remains the evidence-backed approach regardless of feeding method. — Kirshenbaum, The Nurture Revolution

• Offer objects within reaching distance; let the baby swat and bat. Free movement on a firm, flat surface — no propping into positions the baby cannot get into alone. — Eliot, What's Going On in There? and — Gerber, Your Self-Confident Baby
• Help your baby feel Safe, Seen, and Soothed — the first three of the Four S’s. Safe: protect from threat. Seen: known for who they are. Soothed: help them return to calm. These build the foundation for the fourth, Secure. — Siegel & Bryson, The Power of Showing Up

• Successful reach and grasp (4–5 months). — Eliot, What's Going On in There?
• Controlled reach and grasp (6–7 months). — Eliot, What's Going On in There?
• Rolls back to tummy (6–7 months). — Eliot, What's Going On in There?
• Sits alone (6–8 months, normal range 5–9 months). — Eliot, What's Going On in There?

• The four S's of secure attachment begin here: help the child feel Safe (protect from threat), Seen (known for who they are), Soothed (help them return to calm), and Secure (the integrated result). — Siegel & Bryson, The Power of Showing Up
• The Circle of Security: a secure attachment forms when a parent can help the child feel safe when frightened, help the child feel secure enough to explore, and help the child accept and manage emotional experience. At this age the parent is both the "safe haven" (to return to) and the "secure base" (to explore from). — Hoffman, Cooper & Powell, Raising a Secure Child
• All infant stress is communication — the baby's stress systems are overwhelmed and they need to "borrow your calm, regulated brain" to come back into a safety state. You are the bridge between their threat and safety states; only the baby can walk over it. — Kirshenbaum, The Nurture Revolution

• The vertebrate patterns begin with spinal movement (head-to-tail, correlating to fish) and progress to homologous movement (symmetrical two-upper or two-lower limbs together, correlating to amphibians). — Cohen, Sensing, Feeling, and Action
• Yield and push patterns develop before reach-and-pull patterns — the infant must yield into the floor before pushing away from it. — Cohen, Sensing, Feeling, and Action

• Around 3–5 months, sleep cycles mature to an adult-like structure — cycling through light, deep, and REM sleep. This reorganization often brings more frequent night-wakings. This is a normal, temporary phase of brain development, not a regression. — Ball, How Babies Sleep
• The circadian rhythm continues maturing; melatonin and cortisol rhythms are not yet fully established. — Kirshenbaum, The Nurture Revolution

• Feeding patterns continue to stabilize. Breastmilk or formula remains the sole source of nutrition. The World Health Organization and AAP recommend exclusive milk feeding for about the first six months. — Oster, Cribsheet

• What changes: Described as “the most troublesome leap.” The baby grasps that events have a beginning, middle, and end — anticipates routines, studies how objects interact (grasps, shakes, drops, bangs).
• Fussy phase: Intense clinginess, may last 1-5 weeks. Sleep is often disrupted.
• How to support: Repetitive cause-and-effect games (drop-and-pick-up). Maintain predictable routines. Offer extra comfort at bedtime.
• Note: Leap timing is approximate and varies per baby. This is not a diagnostic schedule. — van de Rijt & Plooij, The Wonder Weeks

• Floor time on a clean, firm surface with interesting objects just out of reach. Let the baby reach, roll, and explore physical properties (shape, weight, texture). — Eliot, What's Going On in There?
• Allow uninterrupted free play and natural gross-motor development on the child's own timeline — observe, don't intervene. — Gerber, Your Self-Confident Baby
• Be the “hands on the Circle of Security”: follow your child’s needs whenever possible, take charge whenever necessary. “We are bigger, stronger, wiser, and always kind.” You are both the safe haven (to return to for comfort) and the secure base (to explore from). — Hoffman, Cooper & Powell, Raising a Secure Child

• Pulls to stand (8–9 months). — Eliot, What's Going On in There?
• Crawls (~9 months). — Eliot, What's Going On in There?
• Pincer grasp — thumb and forefinger (~9 months). — Eliot, What's Going On in There?

• Stranger anxiety and separation anxiety emerge and peak around 8–9 months, reflecting object permanence and attachment. — Eliot, What's Going On in There?
• Within the first nine months, before babies can walk or talk or even crawl, they match a happy or sad or angry face to the matching emotional tone of voice — cross-modal emotion perception. — Gopnik, Meltzoff & Kuhl, The Scientist in the Crib

• Attachment and stranger anxiety emerge together, beginning around six months of age and growing increasingly intense until about eighteen months. This is strikingly universal across cultures — urban America, Israeli kibbutzim, Guatemalan villages, and primitive African societies all show it at the same age. The timing corresponds to the onset of independent locomotion: babies don't need to feel attached until they can crawl away. — Eliot, What's Going On in There?
• Social referencing emerges by ~9 months — the baby reads the parent's emotional expression to decide how to feel about an ambiguous situation (e.g., a stranger, a new toy). This is the attachment figure becoming "an important source of how we should feel about the world." — Eliot, What's Going On in There?
• When babies cry or cling, responding does not reinforce the behavior — it reduces it. "When we respond to crying and clinging, babies cry less and we build the infant brain to be more independent later." More responsiveness builds a resilient stress system, secure attachment, and supports social, language, and cognitive development. — Kirshenbaum, The Nurture Revolution

• Homolateral movement (same-side arm and leg, correlating to reptiles) organizes crawling; contralateral movement (diagonal opposite arm and leg, correlating to mammals) — the pattern underlying efficient crawling and walking — begins to emerge. — Cohen, Sensing, Feeling, and Action

• The circadian clock is now well-established, with clear day-night differentiation. Night-waking continues to be biologically normal and is not associated with negative developmental outcomes. — Ball, How Babies Sleep
• Separation anxiety, which also emerges around this age, can affect settling. — Kirshenbaum, The Nurture Revolution

• Starting solids (~6 months). The old advice to introduce foods in a fixed order (rice cereal first, then purees) is not evidence-based. Two equally valid approaches: traditional purees (parent feeds with a spoon) and baby-led weaning (baby self-feeds soft finger foods). A randomized trial found baby-led weaning did not increase choking risk. — Oster, Cribsheet
• Allergens: Early and regular exposure to the eight major allergens (especially peanuts) dramatically reduces allergy risk — the LEAP trial showed early peanut exposure cut peanut allergy from 17% to 3%. — Oster, Cribsheet
• Honey must be avoided (risk of infant botulism). Whole cow's milk should not replace breastmilk or formula as a main drink before 12 months (low iron). Vitamin D drops are recommended for breastfed babies; iron-rich foods or supplementation are important after 6 months. — Oster, Cribsheet
• Repeated neutral exposure to new foods (8–15 tries) builds acceptance; pressuring or offering alternatives in response to refusal tends to backfire. — Oster, Cribsheet

• Safe spaces to roll, crawl, and pull up. Small, graspable objects to develop the pincer grasp. — Eliot, What's Going On in There?
• Respond to separation distress as a signal, not a problem to be trained out. — Eliot, What's Going On in There?
• When your baby cries or clings, respond — it does not reinforce the behavior, it reduces it. “When we respond to crying and clinging, babies cry less and we build the infant brain to be more independent later.” You are the bridge between their threat and safety states; only the baby can walk over it. — Kirshenbaum, The Nurture Revolution
• Cross-crawling matters for brain development and later learning; avoid anything that shortens crawling time (baby walkers, leg splints, or braces). — Baldwin Dancy, You Are Your Child's First Teacher

• Cruises with handholds (9–10 months). — Eliot, What's Going On in There?
• Stands alone (11–12 months). — Eliot, What's Going On in There?
• Walks alone (12–13 months, normal range for walking well is 9–15 months). — Eliot, What's Going On in There?

• The parent is now a "secure emotional base from which [the baby] can test her new assertiveness, someone to whom she can periodically return for comfort and reassurance." Attachment complements growing independence — exploration and reunion alternate. — Eliot, What's Going On in There?
• Between about 12 and 18 months, most toddlers are elated by their newfound ability to move around; returns to the parent are often brief ("no more than a touch") and the forays into the world hold the thrill. The secure base enables this exploration. — Lieberman, The Emotional Life of the Toddler
• Attachment isn't about being perfect. When you misattune, repair matters: neuroscience shows the brain is "constantly comparing new experiences with old ones, updating and changing." "Earned secure attachment" is possible at any age through consistent showing up. — Siegel & Bryson, The Power of Showing Up and — Hoffman, Cooper & Powell, Raising a Secure Child

• The contralateral pattern (left arm with right leg, right arm with left leg) fully integrates through creeping and crawling, setting the neurological baseline for walking. Cohen's view: all babies need to move through all the patterns to be "fully rounded," even if they can walk without them. — Cohen, Sensing, Feeling, and Action

• Sleep consolidation progresses but normal night-waking persists for many babies. Night feeding remains common. Self-settling matures gradually over the first year or two — it is not a skill that must be taught. — Douglas, The Discontented Little Baby Book

• Expanding variety of solids alongside continued milk feeds. Self-feeding practice with graspable foods; cup introduction. The transition toward family foods continues. — Oster, Cribsheet
• Breastmilk or formula remains the primary source of nutrition through the first year. — Oster, Cribsheet

• What changes: The baby discovers sequences — things must happen in order. For the first time, the baby tries to put things together rather than taking them apart.
• Fussy phase: 3-7 weeks of the three Cs. Frustration at not being able to execute sequences perfectly. Sleep may be disrupted.
• How to support: Simple step-by-step activities (stacking, putting in and taking out). Narrate sequences. Allow repeated practice.
• Note: Leap timing is approximate and varies per baby. This is not a diagnostic schedule. — van de Rijt & Plooij, The Wonder Weeks

• Low, stable furniture to cruise along. Open floor space. — Eliot, What's Going On in There?
• Trust the process — "from the moment of birth to wriggling to crawling to sitting to creeping to standing, the infant approaches this goal" of walking, "the triumphant accomplishment of a year or so of dauntless preparation." — Cohen, Sensing, Feeling, and Action
• Repair, repair, repair. “There’s no such thing as perfect parenting.” When you misattune or a rupture happens, reconnect as soon as you can — repair is what builds secure attachment, not flawlessness. — Siegel & Bryson, The Power of Showing Up

• Walks well (normal range 9-15 months for walking well). — Eliot, What's Going On in There?
• Squats to pick up objects, may climb stairs with help, carries objects while walking. — Eliot, What's Going On in There?

• Points to body parts, follows simple commands, uses 1–5 words, experiments with cause and effect (dropping, banging). Social referencing is well-established — the toddler reads the parent's face to evaluate ambiguous situations. — Eliot, What's Going On in There?

• “Elated by newfound mobility” — exploration/return cycles continue; returns to the parent are often brief, “no more than a touch.” — Lieberman, The Emotional Life of the Toddler
• Repair after ruptures is key — misattunements are normal and reconnection builds security. — Siegel & Bryson, The Power of Showing Up

• The contralateral pattern fully integrates through walking; yield-and-push reflexes mature into controlled locomotion. — Cohen, Sensing, Feeling, and Action

• The one-nap transition typically occurs somewhere in this window (range: 10–18 months). Night-waking continues to be normal and variable. Sleep needs remain highly individual. — Ball, How Babies Sleep

• Transition to family foods accelerates. Whole cow's milk can be introduced as a drink. Self-feeding with utensils begins. Appetite varies day to day — this is normal and not a cause for concern. — Oster, Cribsheet

• Low, stable furniture; open floor space; narrate actions. Offer limited choices (“the red cup or the blue cup?”). Follow, don’t lead. — Eliot, What's Going On in There? and — Gerber, Your Self-Confident Baby

• Runs stiffly, walks up stairs with hand held, throws a ball, scribbles. — Eliot, What's Going On in There?

• Points to body parts, follows simple commands, uses 5-20 words, uses objects as tools. — Eliot, What's Going On in There? and — Gopnik, Meltzoff & Kuhl, The Scientist in the Crib

• Separation anxiety peaks around 18 months; the child is caught between autonomy and need for security. — Lieberman, The Emotional Life of the Toddler
• Repair after ruptures is key — misattunements are normal and reconnection builds security. — Siegel & Bryson, The Power of Showing Up

• The contralateral pattern continues to refine through complex locomotion — running, climbing, dancing. — Cohen, Sensing, Feeling, and Action

• Sleep continues maturing; normal variability in night-waking and nap needs persists. Most toddlers still benefit from one daytime nap. — Ball, How Babies Sleep

• Independent eating progresses with growing motor skills. Food neophobia (rejection of new foods) and picky eating are normal developmental phases, not behavioral problems. Repeated neutral exposure without pressure remains the most evidence-backed strategy. — Oster, Cribsheet

• What changes: The toddler discovers that principles are connected into systems. They begin to understand social systems (family roles, turn-taking) and show empathy in rudimentary form.
• Fussy phase: May be bossy, demand things “just so,” melt down when systems don’t work as expected.
• How to support: Explain systems simply (“first shoes, then outside”). Maintain predictable family routines. Model flexibility when systems break.
• Note: Leap timing is approximate and varies per baby. This is not a diagnostic schedule. — van de Rijt & Plooij, The Wonder Weeks

• Name objects and feelings; offer limited choices (“the red cup or the blue cup?”); allow safe exploration; acknowledge frustrations before redirecting. — Eliot, What's Going On in There?, — Gerber, Your Self-Confident Baby, and — Faber & King, How to Talk So Little Kids Will Listen