Can a 4-month-old baby sleep on their stomach?

A 4-month-old baby sleeping on their stomach is not recommended. Your confusion about this is totally understandable, because on one hand babies may seem more comfortable sleeping face-down, but on the other hand there are safety concerns.

Short answer: Place your baby on their back for every sleep — nights and all daytime naps included. This is the single most important measure to reduce the risk of sudden infant death syndrome (SIDS). The American Academy of Pediatrics (AAP) and Turkey's Ministry of Health both recommend this.

Why?

• Most 4-month-old babies can't yet turn their heads and necks strongly and with control. If placed face-down, their airway could become blocked.
• Even if your baby rolls onto their stomach during sleep, you should gently turn them back onto their back (until their doctor says they roll easily and safely on their own).
• Tummy time (during the day, awake, supervised) strengthens your baby's muscles — but not for sleeping.

What you can do:

• Keep the crib empty: no pillows, blankets, toys, or bumpers. Use a firm, flat mattress.
• Place your baby on their back, and you can gently turn their head to the side. You can use a sleep sack (instead of blankets).
• In the early months, share a room (separate bed/crib in the same room) — this also reduces risk.

If you still have concerns about this, talk with your baby's pediatrician — it's important for your peace of mind too. For now, remember: back sleeping is safest.