How Much Sleep Does My Baby Need? A Complete Guide by Age

The Question Every Parent Has

Whether you're staring at a two-week-old who seems to sleep all day and then scream all night, or a nine-month-old who's suddenly resisting every nap, the question underneath most baby sleep concerns is the same: Is this normal? Are they getting enough?

Sleep needs change dramatically in the first three years of life, and the difference between what a newborn needs and what a two-year-old needs is enormous. Equally important: there's real variation within age groups — not every baby at six months needs exactly the same amount of sleep, and knowing the range helps you calibrate expectations rather than chasing a single number.

Here's what the research actually says, age by age.

The AAP and NSF Recommendations

The most widely used guidelines for infant and child sleep come from two sources: the American Academy of Pediatrics (AAP), which publishes age-specific sleep recommendations as part of its broader pediatric health guidance, and the National Sleep Foundation (NSF), which conducts periodic systematic reviews of sleep science to update its recommendations.

Both organisations are clear that sleep totals include all sleep across a 24-hour period — nighttime sleep plus all naps. The numbers below reflect these consensus guidelines, updated as of their most recent reviews.

Sleep by Age: Newborns (0-3 Months)

Total sleep needed: 14-17 hours per 24 hours.

Newborns have no circadian rhythm. Their sleep is distributed randomly across day and night in short stretches, typically 2-4 hours, interspersed with feeding. This is completely normal and reflects their developmental stage — the part of the brain that regulates day/night cycles (the suprachiasmatic nucleus) is still maturing, and it can't do its job without light exposure and social cues to train it.

A newborn sleeping 14 hours might have those hours spread across 8-10 separate sleep periods. There's no meaningful "night sleep" versus "nap" distinction yet — just sleep. Managing a newborn's sleep is less about scheduling and more about meeting their needs promptly, maximising darkness and quiet during overnight hours, and taking any rest you can when they sleep.

The circadian rhythm typically begins consolidating from around 6-8 weeks, when many parents notice longer first stretches at night starting to emerge.

Sleep by Age: 3-6 Months

Total sleep needed: 12-16 hours per 24 hours.

By three months, many babies are beginning to show the first signs of day/night organisation. Overnight stretches may be lengthening to 4-6 hours for some babies, and naps are starting to become more predictable. Most babies this age take 3-4 naps per day, and wake windows (the amount of time they can comfortably stay awake) are typically 60-90 minutes.

The four-month mark brings what's commonly called the "four-month sleep regression" — actually a permanent shift in sleep architecture as babies' cycles begin to resemble adult patterns. This is a key developmental milestone that makes sleep temporarily harder, and it's the age at which sleep associations become particularly relevant because babies now cycle through lighter sleep stages more frequently.

Sleep by Age: 6-9 Months

Total sleep needed: 12-15 hours per 24 hours.

This is one of the most productive ages for sleep work. By six months, babies have the neurological maturity to begin learning independent settling skills, many are physiologically capable of longer overnight stretches without a feed, and wake windows have extended to around 2-3 hours.

Most babies this age take 2 naps — a morning nap and an afternoon nap — totalling roughly 2.5-3.5 hours of daytime sleep. The transition from 3 naps to 2 typically happens somewhere between 5 and 8 months, and it's one of the most impactful schedule changes of early infancy.

Overnight sleep at this age is typically 10-11 hours, though many babies still take one or two night feeds, particularly if breastfeeding. The AAP notes that most babies are nutritionally capable of longer overnight stretches by six months, but individual variation is significant and a conversation with your pediatrician is always worth having before night-weaning.

Sleep by Age: 9-12 Months

Total sleep needed: 12-15 hours per 24 hours.

Wake windows extend to 3-4 hours by this age, and most babies are solidly on two naps totalling about 2-3 hours. The second nap is critical: dropping it too early (before 13-18 months) almost always results in an overtired baby who sleeps worse overall, not better.

The 8-10 month period often brings another developmental surge — object permanence, pulling to stand, separation anxiety — that temporarily disrupts sleep. This is a phase, not a regression in the permanent sense, and it typically resolves within two to four weeks if the schedule and routine stay consistent.

Overnight sleep at this age is typically 10-11 hours, and many babies are capable of sleeping through without feeds by 9-12 months. But "capable" and "doing it" are different — sleep associations often explain continued overnight waking more than genuine hunger does.

Sleep by Age: 12-18 Months

Total sleep needed: 11-14 hours per 24 hours.

The transition from two naps to one typically happens somewhere in this window, with the average falling around 15 months. Signs a baby is genuinely ready include consistently refusing the second nap for two to three weeks, taking a good single nap of 1.5-2 hours without trouble, and managing a longer wake window in the afternoon.

One nap usually settles around the early-to-mid afternoon — somewhere between noon and 2:00 p.m. depending on the child — and lasts 1.5-2.5 hours. Overnight sleep at this age is typically 10-12 hours.

The 18-month regression is one of the most reliably difficult periods of toddler sleep, driven by a significant language explosion, increased autonomy, and often the addition of molars. It typically lasts two to six weeks and then resolves.

Sleep by Age: 18 Months to 3 Years

Total sleep needed: 11-14 hours per 24 hours.

Most toddlers in this range are on a single nap lasting 1-2 hours, with overnight sleep of 10-12 hours. The nap itself typically disappears somewhere between 2.5 and 5 years, with significant individual variation — some children give it up comfortably at two, others need it until four.

The two-year regression and three-year developmental disruption are common in this period, usually driven by cognitive leaps, big life transitions (new sibling, starting nursery, moving house), or simply the ongoing negotiation that characterises toddler development.

Even when the nap is dropped, a quiet time in the afternoon remains valuable for many toddlers — 30-60 minutes in their room with books or calm activities helps manage afternoon energy without requiring sleep.

What to Do If Your Baby Seems to Need More or Less Than Average

Sleep needs genuinely vary between individuals. A baby who consistently sleeps at the lower end of the recommended range and seems happy, well-rested, and developmentally on track probably just needs a bit less sleep than average. A baby at the high end who wakes up bright and ready to go has similar good news.

The most important signal is your baby's behaviour during wake periods. A well-rested baby is generally calm, alert, engaged, and tolerates normal frustrations reasonably well. An under-slept baby tends to be fussier, more clingy, harder to settle, and may show signs of fatigue earlier in the wake window than expected.

If you're consistently outside the recommended ranges — particularly on the low end — it's worth raising with your pediatrician, as some medical conditions (iron deficiency, sleep-disordered breathing, reflux) can reduce sleep quality and duration.

A Word on Total Sleep Versus Consolidated Sleep

The AAP's numbers represent total sleep in a 24-hour period, not necessarily how it's distributed. Two babies can both get 13 hours of sleep — one through a long overnight stretch plus one good nap, another through a moderate overnight with several naps — and both can be appropriately rested. The specific distribution matters more as babies get older and as night sleep consolidates.

Waking overnight isn't automatically a sign that a baby isn't getting enough sleep. The quality and distribution of sleep, along with daytime behaviour, tell a more complete story than any single metric.

Use the Ranges as a Framework, Not a Prescription

The right amount of sleep for your baby is ultimately the amount that leaves them thriving during the day. Use the recommended ranges as a starting calibration point, watch your baby's cues, and adjust from there. And if you want help building a schedule that works for your baby's specific age, weight, temperament, and current routine, LunaCradle's personalised sleep plans do exactly that — adjusting in real time as your baby grows and their needs change.

This article is based on published research from the American Academy of Pediatrics (AAP), the National Health Service (NHS), and peer-reviewed pediatric sleep studies. It is not medical advice — always consult your pediatrician for individual guidance.