Hide a ball or other object under a blanket while he is watching you and let him find it. Give him a metal pan and show him how to bang on it. Let him have fun making the sounds. Place him on the floor on his stomach. Encourage him to move toward you by clapping your hands and laughing.
Crawling is needed to develop other skills .
Place round oat cereal on his highchair tray and let him practice picking it up and putting it in his mouth. His eye and hand muscles will get strong and begin to work together. Let him practice dropping unbreakable things like soft balls over the side of the bed or high chair in order to learn what happens when he drops something.