You can make blocks out of empty, rinsed-out milk cartons. Open up the top, and fold it down to make a cube. Tape each block shut. Baby may enjoy larger toys, too. A cardboard box with the ends cut out can be a tunnel.
Baby can roll over a pillow or beachball, and crawl into a paper grocery bag.
Children love to do the things their parents do. By 12 months, about 25 percent of babies will imitate housework. If you paint, let him paint with water. Or give him a broom, toy hammer, dusting cloth or other object to do work just like you. A smart thing to teach your child is to say Ahhh, open her mouth wide and stick out her tongue.