Baby is 11 months old and doesn't play with toys, he just throws them around. Throws, then crawls after them, throws again etc. I wouldn't be concerned but he doesn't seem to know how to put something down - he has never released a toy with control or put something down on the floor, table, in a box, into my hand etc. Everything just goes flying. Should I be worried? Is there anything I can do to encourage him and help learn how to put toys down?