Your baby is busy absorbing all the sights and sounds around him. How? By looking, listening and touching. Keep those brain cells multiplying by letting your baby handle a variety of objects, such as soft teddy bears, light rattles and rubber balls. Just make sure they're too big for him to put in his mouth and choke on. If your baby has an older brother or sister, you'll need to take extra care that he or she isn't passing marbles, small bricks or buttons to him.