Baby Development Month by Month

What to expect at every age from 1 month on: development and milestones, sleep totals and wake windows, feeding, crying and soothing, and when to talk to your pediatrician.

How old is your baby?

Newborn baby lying on a soft blanket, looking up alertly

1 month old

Your 1-Month-Old: Development, Sleep and Feeding

Most newborns sleep 14 to 17 hours across a full day, in short stretches.

Two-month-old baby sleeping on their side on a white bed

2 months old

Your 2-Month-Old: Development, Sleep and Feeding

The social smile arrives for many babies around 6 to 8 weeks.

Close-up of a baby's eyes making direct eye contact

3 months old

Your 3-Month-Old: Development, Sleep and Feeding

Hands become fascinating: batting, grabbing and mouthing everything within reach.

New months are added regularly; each page is reviewed against AAP, CDC and WHO guidance before publishing.