Week 15 of 52 · Month 4
Week 15: Your 15-Week-Old Baby
Rolling practice in both directions; blows raspberries.
Wake window
1.2 hours to 2 hours
Total sleep
14–15.5 hrs / 24h
Naps
3–4 per day
Feeding
6–8 milk feeds
Sleep at 15 weeks
At 15 weeks, most babies are awake for 1.2 hours to 2 hours at a stretch and sleep 14–15.5 hours across the full day, over 3–4 naps plus nighttime sleep. The first wake window of the day is usually the shortest and the last one before bed the longest — the wake-window calculator spreads them out for you.
Development this week
Rolling practice in both directions; blows raspberries.
What's normal this week
- Sleep: about 14–15.5 hours total, in 3–4 naps plus night sleep. Many babies consolidate night sleep now, though regressions around growth spurts happen.
- Awake time: roughly 1.2 hours to 2 hours between sleeps. Rolling practice in both directions; blows raspberries.
- Feeding: 6–8 milk feeds a day is typical. Feeds often get shorter and more efficient as baby gets distracted by the world.
Week 15 questions
How long should a 15-week-old be awake between naps?
Most 15-week-olds handle about 1.2 hours to 2 hours awake at a time. Watch for sleepy cues — staring off, jerky movements, fussing — and start the nap routine a few minutes before the top of the window.
How much sleep does a 15-week-old need in 24 hours?
Typical total sleep at 15 weeks is about 14–15.5 hours in 24 hours, usually split into 3–4 naps plus nighttime sleep. A day or two outside that range is common and usually not a concern on its own.
How often should a 15-week-old eat?
Most 15-week-olds take about 6–8 milk feeds in 24 hours. Feeding on cue is still the guide — these counts are typical ranges, not quotas. Steady wet diapers and weight gain matter more than hitting an exact number.
Educational information only — not medical advice. Every baby develops and sleeps on their own timeline. If you have any concern about your baby's sleep, feeding, or development, talk to your pediatrician.