Development

Baby Milestones: 1 to 6 Months

From the jerky, fisted movements of a newborn to a six-month-old rolling, babbling, and reaching for a spoon, the first half-year covers more developmental ground than almost any other stretch of life — and it happens on a wide, normal spectrum rather than a fixed timetable.

By the Nooma Editorial Team 13 min read Reviewed July 8, 2026 First 2 years

A baby lifting their head during tummy time, beaming at a parent lying at eye level

Safe sleep reminder: Always place baby on their back to sleep, on a firm, flat sleep surface in their own crib, bassinet, or play yard, with a fitted sheet only and no loose blankets, pillows, bumpers, stuffed animals, or other soft items.

Sleep and feeding at a glance

Total sleep needs, nap counts, and feeding volumes shift steadily across these six months. This isn’t a script to hit exactly — think of it as the general shape most babies follow.

Age	Total sleep (24h)	Naps	Typical wake window	Feeding
1 month	~15.5 hours	No set schedule yet; length varies from 10 min to 2 hours	30-90 minutes	Every 2-3 hours; 8-12 feeds/day
2 months	~15.5 hours	4-5 naps (~5-6 daytime hours)	Still building toward regularity	Every 3-4 hours; ~4-5 oz per feeding
3 months	~15 hours, incl. 10+ overnight	4-5 naps, still irregular	60-120 minutes	Every 3-4 hours by day, longer overnight; 2-6 oz per feeding
4 months	~15.5 hours (day-to-day sleep can look messier during the sleep maturation below)	3-4 naps, often 30-45 min each (~3.5-4.5 daytime hours)	Lengthening from 3-month range	Milk only; hunger cues still guide timing
5 months	~14.5 hours	3-4 naps (~2.5-3.5 daytime hours)	1.5-2.5 hrs (4-nap) → 2-3 hrs as some shift to 3 naps	4-6 feeds; ~22-28 oz (650-830 mL) total per day
6 months	~14.5 hours	3 naps (~2.5-3.5 daytime hours), extending as the day goes on	2-3 hours	Milk remains primary; solids may begin; up to 8 oz every 4-5 hours

A note on wake windows: a wake window is simply how long it’s been since a baby’s last sleep period. Watching it — alongside sleepy cues like yawning, irritability, or a glazed, faraway look — helps you get baby down before they’re past their sleep window and harder to settle.

1 month

At one month, life is still largely reflexive and reactive. Movements are jerky, hands stay mostly fisted, and your baby may briefly bring their hands near their eyes or mouth without full coordination yet. During tummy time, expect only a brief head lift. Vision is limited to about 8-12 inches — roughly the distance to your face during a feed — and babies this age strongly prefer high-contrast black-and-white patterns and human faces over anything else. Hearing is already fully mature, so familiar voices can turn a head. Smell and touch are doing quiet work too: babies gravitate to sweet scents, can recognize the smell of their mother’s milk, and settle more easily with soft textures, swaddling, and close contact than with rough handling.

Growth this month is brisk: after regaining birth weight, expect roughly an ounce a day, plus 1-1.5 inches in length, often arriving in bursts around 7-10 days and again near 3 and 6 weeks. Because there’s no predictable 24-hour rhythm yet, don’t expect naps or nights to fall into any order — that’s normal. Many babies also go through a stretch of increased evening fussiness (sometimes called the “witching hour”) starting around 2-3 weeks, peaking near 6 weeks, and easing by about 12 weeks. Tummy time can start as early as your first day home: a few minutes, a couple of times a day, building toward 15-30 minutes total by around 7 weeks, always supervised.

2 months

By two months, movements smooth out and tummy-time strength grows — most babies can lift their head to nearly 45 degrees and start pushing up on their forearms. Hands begin opening and relaxing more, even though fists are still common. This is also the month true social smiling typically appears — a real response to you, not the reflexive smiles of the newborn weeks — alongside the first coos and the beginning of visual tracking of people and familiar toys.

Around 8 weeks, a baby’s internal clock starts to switch on, helping them begin telling day from night; keeping days bright and active and nights dim and calm supports that shift. Growth continues at a good clip (roughly 2 pounds and 1-1.5 inches this month), and a growth spurt around now can bring a few days of near-hourly cluster feeding — completely normal and often a sign of a hungry, growing baby rather than a feeding problem. Tummy time should build to 15-30 minutes total per day across 5-10 short sessions. Skin-to-skin contact remains a simple, powerful tool at this age — it can help regulate your baby, and has been linked to lower rates of postpartum mood symptoms in caregivers, too.

3 months (12 weeks)

Three months is often the month everything starts to feel more interactive. Expect a real social smile — frequently triggered by hearing a familiar voice — plus sustained eye contact, intent face-watching, tracking of moving objects, and a head-turn toward sound. Hands are more capable now: opening and closing, grasping toys, and swiping at dangling objects. Some babies begin showing very early rolling signs, like reaching for a toy while on their tummy, though full rolling is still a few months off for most.

Sleep starts to mature in a specific way: your baby’s rhythm begins forming true light-and-deep sleep cycles, similar to adults, which means more full wake-ups between cycles — some babies need help resettling, and that’s expected rather than a step backward. The stretch of unexplained, prolonged crying some babies go through in the early weeks typically eases by around 12 weeks. Vision keeps sharpening too, with brighter colors becoming visible even as softer pastel shades are still hard to distinguish. Aim for close to an hour of tummy time a day, spread across the day. And because early rolling signs can appear this month, this is a good checkpoint to stop swaddling the moment you see any sign your baby might roll.

4 months

Four months brings one of the most talked-about stretches of the first year: the so-called “sleep regression.” It isn’t really a regression — it’s your baby’s brain maturing into adult-style sleep cycling — but it can look like rockier nights, fussier settling, shorter or more broken naps, and a more distracted feeder during the day. It usually eases as your baby adjusts to the new sleep architecture.

Physically, this is often the month steady head control arrives — including while being held — and tummy time shows real strength: a 90-degree head lift, forearms planted, chest lifted, elbows under shoulders. Reaching and grabbing take off (toys, blocks, dangling objects), and mouthing everything becomes a favorite way to explore, so it’s worth double-checking your baby’s space for anything small enough to be a choking hazard. Many babies also start rolling tummy-to-back around now, usually practicing that direction for a month or two before working out the reverse. Socially, smiles become more deliberate, early chuckles appear, and cries start to sound different depending on whether your baby is tired, hungry, or hurting; cooing sounds like “ooo” and “ahh” become common, and a familiar voice reliably turns a head. Growth-wise, many babies have now doubled their birth weight, gaining roughly 1-1.25 pounds a month through the 4-6 month stretch. Solids are still a couple of months out per AAP guidance, even as early readiness pieces — sitting with decent head control, bringing objects to the mouth, grabbing small items — start to show up. Tummy time now totals around 90 minutes a day.

5 months

At five months, gross motor skills keep layering: rolling both directions with more confidence, sitting with support (pillows or a lap work well — full independent sitting is still a couple of months away for most), and purposeful kicking. Babbling takes a real step forward with sounds like “gaga” and “goo,” often paired with coos and big smiles. Fine motor skills grow too — reaching and grabbing with both hands and banging objects together or on a surface.

This is often a transition month for naps: some babies are still on 4 naps with 1.5-2.5 hour wake windows, while others start stretching toward 3 naps with 2-3 hour windows. An inconsistent nap count during this shift is completely normal — it doesn’t need fixing. Feeding stays milk-only, typically 4-6 feeds totaling around 22-28 ounces a day, with 4-6 wet diapers a day a helpful sign that intake is on track. Readiness signs for solids — mouthing objects, watching food with interest, better head and neck control, sitting with support — often start appearing now, but the AAP’s current guidance is still to wait until around 6 months to start. Growth this month is typically 1-1.25 pounds and about half an inch to an inch in length.

6 months

Six months is a genuine turning point. Most babies are rolling confidently in both directions and sitting with a little support, giving them a whole new vantage point on the world — and since rolling is now well established, this is the point to have fully stopped swaddling if you haven’t already (per AAP safe-sleep guidance), and to consider moving diaper changes to the floor rather than an elevated table. Babbling becomes more rhythmic — repeated sounds like “mamama,” “bababa,” “dadada” — and many babies start copying simple gestures like nodding or shaking their head. Laughing typically emerges around now too, along with more enthusiasm for social games like peekaboo. Mild wariness of unfamiliar faces is also common at this stage as babies get better at telling familiar caregivers from strangers — a normal sign that they’re bonding deeply, not a setback.

Fine motor skills take a leap: a raking grasp (scooping with all fingers together), reaching with either hand, shaking objects, and transferring things from one hand to the other — worth another pass through your baby’s play area for small, chokeable items. Nap-wise, many babies are settling toward 3 naps with wake windows of 2-3 hours that stretch out as the day goes on; a lingering 4th nap can push bedtime later and shorten the night, and resisting the 3rd nap around now is usually just a phase rather than a sign a baby’s ready to drop to 2 naps (that’s typically more like 7-9 months). Feeding-wise, milk remains the main event — up to 8 ounces every 4-5 hours — but six months is also when many families begin solids, guided by the same readiness signs: independent head control, sitting with support, and clear interest in food. Purées, baby-led weaning with soft table foods, or a mix of both all work; start with one meal a day and treat this stage as exposure and skill-building rather than a calorie source, since babies eat only small amounts at first. It’s also a good time to introduce a few sips of water at mealtimes from a small open cup, and — once your pediatrician has weighed in — to start offering common allergens like peanut, egg, and dairy in small, regular amounts, since early and frequent exposure may lower the risk of developing a food allergy later.

Newborn reflexes: what they look like, when they fade

Several automatic reflexes are present from birth and quietly do a lot of work before fading out as voluntary movement takes over.

Reflex	What it looks like	Typically fades
Rooting	Turns head and opens mouth when the cheek or mouth corner is touched, helping find the breast or bottle	~4 months
Sucking	Present from around 32 weeks gestation, fully matured by ~36 weeks (a premature baby’s suck may still be developing)	Gradually becomes voluntary over the first year
Moro (startle)	Arms and legs fling out, back arches, head tips back in response to a loud sound or sudden movement	Begins fading ~12 weeks, usually gone by ~6 months
Palmar grasp	Fingers close firmly around anything pressed into the palm	~5-6 months
Stepping	Walking-like leg movements when held upright with feet on a surface	~2 months

A few things that hold true across every one of these months

Feeding by cue rather than clock is the throughline recommended at every age: watch for hunger cues (hands to mouth, sucking motions, rooting, flexed arms and legs) and fullness cues (slowing down, unlatching, turning away, drifting off) and respond to those before crying starts, since crying is a late — and harder-to-work-with — hunger signal. Cluster feeding, where a baby feeds more often and in shorter bursts, shows up around growth spurts at almost every age in this window and is a normal, temporary shift rather than a feeding concern. And when illness strikes at any age from 1 to 6 months, the same basics apply: keep offering breastmilk or formula (smaller, more frequent feeds if full ones aren’t tolerated), ease congestion with a cool-mist humidifier, gentle suction, or saline drops especially before sleep, expect sleep to be a little less predictable for a few days, and lean on a partner or family member — caring for a sick infant is genuinely taxing for caregivers too.

When to reach out

A rectal temperature of 100.4°F (38°C) or higher in a baby under 3 months — call the pediatrician right away, since the immune system is still developing at this age.
For babies 3-6 months, a temperature of 101°F (38.3°C) or higher.
For babies over 6 months, a temperature of 103°F (39.4°C) or higher.
By 1 month: not startling at loud noises, or not briefly following a moving object with the eyes.
By 2 months: no response to loud sounds, not watching things as they move, not bringing hands to the mouth, or being unable to lift the head briefly during tummy time.
By 3-4 months: no social smiling, being unable to push the chest up or hold the head up during tummy time, not turning the head to follow movement, not bringing things to the mouth, or not giggling when you try to coax a laugh.
By 5 months: no cooing sounds, trouble moving the eyes in all directions, not watching things as they move, no social smiling, an unsteady head, not bringing things to the mouth, or not pushing down with the legs when feet touch a firm surface.
By 6 months: not rolling in either direction, not reaching for nearby objects, not showing affection toward familiar caregivers, not responding to nearby sounds, trouble bringing things to the mouth, seeming very floppy or very stiff, no vowel sounds (“ah,” “eh,” “oh”), or no laughing or squealing.

Every baby moves through these months at their own pace, and it’s genuinely common not to have checked off every item on a list exactly within its typical window. These checkpoints are a guide for noticing, not a scorecard — if something feels off or a red flag lingers, the right move is always a conversation with your baby’s healthcare provider rather than trying to puzzle it out from a checklist alone.

Sources

Written from primary pediatric sources. This is general information, reviewed editorially rather than by a clinician — it isn’t a substitute for your pediatrician’s advice about your child.