4 Month Old Baby
BabyWhat to expect from 4 months 0 days to 4 months 30 days.
Welcome to Month 4. Your baby is becoming more active, more social, and more determined every day. Many babies begin developing new physical skills this month while also becoming much more interactive. You may notice lots of smiles, laughter, squeals, and attempts to explore the world. Month 4 can also bring some sleep challenges, but it is filled with exciting milestones.
Sleep
12–16 hours/day
Feeding
Breast milk or formula; solids not yet recommended
Major milestone
First laughs and rolling may begin
Physical development
- check_circleRolling from tummy to back — or attempting to — may begin
- check_circleHolding head very steadily and pushing up during tummy time
- check_circleReaching for and grabbing objects
- check_circleBringing everything to the mouth to explore
Brain development
- check_circleTracking moving objects smoothly
- check_circleRecognizing familiar people and anticipating interaction
- check_circleNoticing colours more clearly
- check_circleWatching activity across the room with clear interest
Social development
- check_circleSmiling before you even interact — recognizing your face and expecting something fun
- check_circleBig reactions to familiar people, songs, and games
- check_circleFirst laughs — giggles, chuckles, and excited squeals
- check_circleBecoming a little social butterfly
Communication
- check_circleLaughing and squealing with delight
- check_circleHappy shrieks
- check_circleMore varied sounds and vocalizations
- check_circleExpressing happiness, frustration, excitement, and tiredness more clearly
What parents may notice
- check_circleMore laughing and smiling — your baby loves interacting with people and shows it enthusiastically
- check_circleEverything goes in the mouth — hands, toys, blankets, and anything within reach are all explored this way
- check_circleMore movement — constant kicking, rolling attempts, arm waving, and squirming as strength and coordination build
- check_circleStrong opinions — happiness, frustration, excitement, and tiredness are all communicated more clearly
Monthly checklist
- Continue tummy time
- Encourage rolling and reaching
- Read and sing every day
- Take monthly photos
- Maintain sleep routines
- Enjoy those laughs and giggles
Frequently asked questions
Should my baby be rolling yet?
Some babies roll this month, while others take a little longer. There is a wide range of normal.
Is the four month sleep regression real?
Many babies experience temporary sleep changes around this age, although not every baby is affected.
Why does my baby put everything in their mouth?
This is one of the main ways babies explore and learn about the world around them.
Is it normal for my baby to laugh now?
Yes. Many babies begin laughing during Month 4 and it is one of the most rewarding milestones for parents.
Looking ahead
Next month brings even more movement and exploration. Your baby may begin rolling confidently, sitting with support, and becoming increasingly determined to reach everything within sight. The days of having a stationary baby are quickly coming to an end.