Around 16–20 weeks
4 Months Baby: Development, Feeding and Sleep
Around four months, many babies grab and mouth toys, push up during tummy time and may start rolling. Laughter and lively babble are common. Some families notice sleep becoming lighter for a while as awareness grows.
These guides describe common developmental patterns, not deadlines. Every baby develops at their own pace.
What this month looks like
Development
Rolling attempts (often tummy to back first), reaching with both hands and bringing objects to the mouth are common. Many babies laugh and babble more.
Feeding
Milk remains the main nutrition. If your baby seems interested in food, discuss readiness signs with your paediatrician rather than starting solids by the calendar.
Sleep
Sleep may become lighter or more broken for a stretch as your baby becomes more alert. This is common and usually settles with time.
Play
Toys that rattle, crinkle or have different textures are engaging. Mirrors and gentle peek-a-boo support social play.
Safety
Once rolling starts, never leave your baby on a raised surface. Keep the sleep space free of soft items and check toys for loose parts.
Medical guidance
A check-up and vaccinations often fall around now. Talk to your doctor before starting solids and about any concerns with rolling or head control.
The weeks in 4 Months
For week-specific guidance, open any week below.
Medically reviewed by Dr. Megha, MD, DNB (Paediatrics) · Last reviewed July 26, 2026. General information only — not a substitute for advice from your own paediatrician.