raise head and chest and push up to elbows when lying on tummy
grasp and shake hand toys
begin to roll over
reach for dangling objects
smile at the sound of your voice
begin to babble
recognize familiar people and toys
enjoy playing and interacting with you
All babies are different and develop at their own special pace, so try not to worry if your baby isn't doing all of these things just yet. You'll probably notice these changes soon. More on infant development.