What to know
View photos and videos of developmental milestones that most babies do by four months of age. Milestones are listed by area of child development.
Social/Emotional
Smiles on his own to get your attention
The baby in this video smiles at his mom to get her attention.
Chuckles (not yet a full laugh) when you try to make him laugh
The baby in this video is chuckling as his parents are trying to make him laugh, a 4-month social/emotional milestone.
Looks at you, moves, or makes sounds to get or keep your attention
The baby in this video is looking, moving, and making sounds to get or keep his parent's attention, a 4-month social/emotional milestone.
Language/Communication
Makes sounds like “oooo”, “aahh” (cooing)
The baby in this video is making sounds like "oooo", "aahh" (cooing), a 4-month language/communication milestone.
Makes sounds back when you talk to him
The baby in this video makes sounds back when his mother talks to him, a 4-month language/communication milestone.
Turns head towards the sound of your voice
The baby in this video turns her head towards the sounds of her mother's voice, 4-month language/communication milestone.
Cognitive
If hungry opens mouth when she sees breast or bottle
Looks at her hands with interest
The baby in this video is looking at her hands with interest, a 4-month milestone.
Movement/Physical
Holds head steady without support when you are holding him
The baby in this video is holding his head steady without support while being held, a 4-month milestone.
Holds a toy when you put it in his hand
The baby in this video is holding a toy when his put into his hand, a 4-month milestone.
Uses his arm to swing at toys
The baby in this video is using his arm to swing at toys, a 4-month milestone.
Brings hands to mouth
The baby in this video is bringing their hands to their mouth, a 4-month milestone.
