Most newborns start giving you longer stretches of night sleep between 6 and 12 weeks, and many can do a 5–8 hour “through the night” stretch somewhere between 3 and 6 months, though there’s a lot of variation.

When do newborns start sleeping longer at night?

Newborn sleep is a process , not a switch that flips one night. You’ll see it change in stages:

Rough timeline (what many parents see)

  • 0–6 weeks:
    • Sleep in many short chunks, 30 minutes to 3 hours at a time, day and night.
* Frequent waking to feed is normal because their stomachs are tiny.
  • 6–10 weeks:
    • Some babies start giving one slightly longer stretch at night, maybe 3–4 hours, sometimes 5–6 hours.
* Total sleep is still about 14–17 hours over 24 hours, but still very broken up.
  • Around 3 months (12+ weeks):
    • Many babies can do one 6–8 hour stretch without waking, especially if they weigh about 12–13 pounds.
* This is often what doctors mean by “sleeping through the night” (not 12 hours straight, just one long stretch).
  • Around 4–6 months:
    • More babies are physiologically able to sleep longer without feeds; some regularly do 6–8 hour stretches.
* Still, 25–50% of babies are _not_ consistently “through the night” at 6 months and still wake to feed or for comfort.
  • 6–12 months:
    • Many babies can sleep 8–12 hours with few or no wakings, but some still wake regularly until close to 1 year (and that’s still normal).
* Developmental leaps and teething often cause regressions where they suddenly wake more again.

A good rule of thumb: by about 3 months, expect one longer stretch; by about 6 months, many (not all) babies sleep much longer at night.

What “sleeping longer at night” really means

Different sources and parents use different definitions:

  • Longer stretch:
    • Usually means 3–4+ hours in a row without waking. Many newborns get there by around 6–8 weeks.
  • “Sleeping through the night”:
    • Often defined medically as 5–8 hours in one stretch, not a full 12 hours.
* Many babies reach this around 3–6 months, but some not until later.
  • 12 hours at night with few wakings:
    • More common toward the end of the first year, especially with consistent routines and if there are no medical or feeding issues.

A little example:
A 10-week-old baby might go 8 p.m.–12 a.m., feed, then 1–4 a.m., then short naps after that. That’s already “sleeping longer” than the early days, even if it doesn’t feel like it at 3 a.m.

What can delay or speed up longer stretches?

Every baby is different, but some big factors play a role:

Things that can delay longer night sleep (and are often still normal)

  • Prematurity or low birth weight (need more frequent feeds).
  • Reflux, allergies, or other medical issues that make lying flat uncomfortable.
  • Growth spurts around 3, 6, and 8 weeks, then again at 3 and 6 months, can cause temporary extra wakings.
  • Sleep associations like only falling asleep while feeding or in arms, then needing that again after every sleep cycle.
  • Overtiredness (ironically, too-late bedtimes and long wake windows can make babies sleep worse).

Things that often help babies stretch sleep sooner

  • Predictable bedtime routine : same calm sequence each night (dim lights, quiet play, bath, feed, story, bed).
  • Safe, comfortable sleep environment : darkened room, white noise, appropriate clothing, crib or bassinet, flat firm surface, on their back.
  • Appropriate wake windows (how long they’re awake between sleeps):
    • Newborns: about 30 minutes–2 hours.
    • By 3–4 months: often 1.5–2.5 hours.
  • Putting baby down drowsy but awake sometimes, so they practice falling asleep in the crib instead of only in your arms.
  • Day/night cues : lights and noise during the day, quiet and dark at night, minimal interaction during night feeds.

None of these guarantee a magical 8-hour stretch, but they stack the odds in your favor.

What real parents are saying (forum flavor)

Online parent forums and communities are full of posts like:

“When do babies actually sleep through the night?”

Common patterns in those discussions:

  • Some parents report lucky unicorns sleeping 6–7 hours by 6–8 weeks.
  • Many say 3–4 months was when they first saw a 6–8 hour stretch.
  • A lot of others say their babies still woke 1–3 times at 6–9 months , and only did really solid nights closer to age 1.
  • Sleep training methods (gentle or more structured) sometimes start around 4–6 months and can help some babies consolidate sleep, but even then there are regressions and off nights.

The big takeaway from these discussions: your baby isn’t “broken” if they’re not sleeping like your friend’s baby. The range of normal is very wide.

Safety first: night sleep and SIDS

Because “sleep longer” sometimes tempts parents to try risky shortcuts, quick safety reminders:

  • Always put baby on their back for sleep, on a firm, flat surface with no soft bedding or pillows.
  • Avoid bed-sharing in situations with soft mattresses, pillows, smoking, alcohol, or very deep sleepers; room-sharing (crib near your bed) is recommended for the first 6 months.
  • Keep the room at a comfortable temperature and avoid overheating with too many layers.

Good sleep is important, but safe sleep comes first , even if it means more night wakings for a while.

When to talk to your pediatrician

Reach out to your baby’s doctor if:

  • Your newborn suddenly sleeps much longer than 3–4 hours and seems difficult to wake to feed.
  • There’s poor weight gain , fewer wet/dirty diapers, or you’ve been told to wake them to feed and you’re not sure when it’s okay to stop.
  • Your baby snores loudly, has pauses in breathing, or seems to struggle to breathe while sleeping.
  • You feel overwhelmed, anxious, or depressed from the sleep deprivation.

They can check growth, health, and help you make a plan that fits your baby’s needs.

Tiny TL;DR

  • Expect very broken sleep for the first 6 weeks.
  • Many babies give one longer stretch (3–5 hours) by 6–10 weeks.
  • A lot can do a 6–8 hour “through the night” stretch somewhere between 3 and 6 months , but many still wake till closer to 1 year , and that can be normal.

Information gathered from public forums or data available on the internet and portrayed here.