They learn to hold their heads up, roll over, sit up, crawl, stand up and, in some cases, walk. Become aware of themselves as separate from others. They learn to look at their hands and toes and play with them. They learn to cry when parents leave, and they recognize their name. Communicate and develop language skills.
First babies cry and make throaty noises.
Later they babble and say mama and dada. Then they make lots of sounds and begin to name a few close people and objects. First they play with their hands. Relate to others. First they respond to adults more than to other babies.