If you've got a 3 month old and you're wondering what time they should go to bed, the good news is: a proper bedtime is finally within reach. At around 10–14 weeks, most babies start to show more predictable sleep patterns — and that means it's a great time to establish a bedtime routine that actually works. Here's what to aim for and how to get there.
At 3 months, most babies need around 14 to 16 hours of sleep per 24 hours, split between night sleep and daytime naps. The split typically looks something like this:
Naps at this age are still fairly short and irregular — don't stress if your baby's daytime sleep is all over the place. The night sleep is the part you want to start nudging into a more consistent pattern.
The sweet spot for a 3 month old bedtime is between 7:30 pm and 8:30 pm. Some babies do well slightly earlier (7:00 pm), others need until 9:00 pm — it depends on their natural wake time and how their naps have gone that day.
The key concept to understand here is the wake window — the amount of time your baby can comfortably stay awake before becoming overtired. At 3 months, most babies can handle about 1.5 to 2 hours of awake time before needing to sleep again. The last wake window before bedtime tends to be the longest — around 90 minutes to 2 hours is typical.
So if your baby woke from their last nap at 6:00 pm, aim for a bedtime around 7:30–8:00 pm.
Putting a 3 month old to bed too late is one of the most common mistakes — and it backfires. An overtired baby fights sleep harder, wakes more frequently, and often starts their day earlier. Earlier bedtime often means better night sleep, not just less time in bed.
On the flip side, too early a bedtime (before 6:30 pm) at this age can result in early morning wake-ups, as the baby completes their sleep cycle and has nothing to keep them asleep.
A consistent routine is one of the most powerful sleep tools you have. It doesn't need to be long — 20 to 30 minutes is plenty. Something like:
Repeating the same sequence every night helps your baby's brain learn that sleep is coming. At 3 months, this association is just starting to form — consistency now pays dividends later.
Here's a rough example based on a 7:00 am wake time:
This is a guide, not a rigid plan. Follow your baby's cues — this is their approximate rhythm at this age, not a schedule to enforce.
Just when you feel like you've nailed this, the 4-month sleep regression may arrive. Around 15–19 weeks, many babies experience a permanent change in their sleep architecture — they move into lighter sleep cycles more frequently, which can cause frequent night waking. It's not a step backwards. It's normal development.
The good habits you build now — a consistent routine, a comfortable sleep environment, putting down drowsy — will help you through it.
The exact right bedtime for your 3 month old depends on when they wake up in the morning. Use the free Kids Sleep Calculator at kidssleepcalculator.com — just enter your baby's age and their usual wake time, and it will calculate the ideal bedtime and tell you how much sleep they should be getting. Quick and genuinely useful.
Aim for a bedtime between 7:30 and 8:30 pm for a 3 month old, adjusted for their natural wake time and nap schedule. Build a simple, consistent routine and stick to it. It won't be perfect overnight — but you're laying the groundwork for better sleep ahead.
For most 3 month olds, 7:00 pm is a reasonable bedtime if they've been awake for about 90 minutes since their last nap. It's not too early — in fact, slightly earlier bedtimes often lead to better overnight sleep. Just watch for early morning wake-ups, which can signal the bedtime is slightly too early for your baby.
The most common cause is overtiredness — if the wake window before bed is too long, babies become overstimulated and harder to settle. Try bringing bedtime slightly earlier. Overstimulation before bed (bright lights, loud noise, lots of play) can also be a factor — a calm wind-down routine helps.
Most 3 month olds take 4–5 naps per day. Naps at this age are often short (30–45 minutes) but some babies will take longer ones. The nap schedule will become more structured as you head towards 4–5 months.
A good framework is: wake time of 7:00–7:30 am, 4 naps during the day spaced by ~1.5 hour wake windows, and a bedtime of 7:30–8:30 pm. Total sleep of 14–16 hours across 24 hours is the goal.
At 3 months, formal sleep training is generally not recommended. However, you can start practising putting your baby down drowsy but awake when the opportunity arises. This gently introduces the concept of self-settling without any training method.
Reviewed by Perry Sutton — Founder, KidsSleepCalculator.com
Last reviewed:
Sources: CDC · American Academy of Pediatrics · NHS