At the end of 3 months, most infants can…
roll from front to back
control head and neck movement when sitting
raise their head and chest when lying on their stomach
stretch out and kick their legs when lying on their stomach or back
push down with their legs when feet are on a firm surface
bring their hands together
open and shut their hands
bring their hands to their mouth
take swipes at a hanging object
smile when you smile and on their own
be expressive and communicate with their face and body
copy some body movements and facial expressions
watch faces closely
follow moving objects
recognize objects and people they know