When Do Babies Sleep Through the Night? (The Honest Answer)

You're reading this at 3am, aren't you?

Here's the honest answer: there's no single age when babies "should" sleep through the night. But understanding what's normal — and what actually helps — can make this season much more manageable.

What "sleeping through" actually means

For a newborn, sleeping "through the night" means a 5-hour stretch. For most sleep-deprived parents, that still sounds like a dream. Full 10–12 hour nights typically don't happen until later in the first year — if at all.

When most babies start sleeping longer

• 0–3 months: Newborns have tiny stomachs and need feeding every 2–3 hours around the clock. Night waking is biologically normal and necessary.
• 3–6 months: Many babies start consolidating sleep and can manage 4–6 hour stretches. Some do longer.
• 6–9 months: The majority of babies are physiologically capable of sleeping through (with no nutritional need for night feeds), though many still wake out of habit or developmental reasons.
• 9–12 months: Most babies can sleep through, but developmental leaps (crawling, pulling to stand, first words) often cause regressions.

The key word is "can" — not "do."

Why babies wake at night (it's not to torture you)

1. Hunger — especially under 6 months
2. Developmental leaps — the brain is processing enormous amounts of information
3. Sleep cycle transitions — all humans wake briefly between sleep cycles; babies haven't learned to self-settle back to sleep
4. Illness or teething — temporary disruption
5. Habit — if feeding or holding to sleep is part of the bedtime routine, they'll call for it overnight

What actually helps

Consistent bedtime routine: Bath → feed → story → sleep, in the same order every night. Predictability helps the brain wind down.

Drowsy but awake: Putting your baby down before they're fully asleep gives them the chance to practice falling asleep independently.

Track the patterns: You can't change what you can't see. Using TinyYears to log sleep times reveals patterns you'd otherwise miss — like whether a late nap is pushing bedtime, or whether night waking clusters around a particular time.

Manage your own sleep: Sleep when the baby sleeps is genuinely good advice for the newborn phase. Don't use nap time to scroll.

Sleep regressions: the plot twists

Just when you think you've cracked it, sleep often regresses. Common regression ages: 4 months, 8–10 months, 12 months, 18 months. These are linked to developmental leaps and are temporary.

When to speak to your GP or health visitor

If your baby is over 6 months, was sleeping well and suddenly isn't, or if you're concerned about sleep apnoea, snoring, or breathing, speak to your GP.

If you're struggling with your own sleep deprivation to the point of feeling unsafe, please ask for help. You deserve support.

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Track your baby's sleep patterns automatically with the TinyYears app. NHS-informed predictions help you understand what's coming next. Download free.