My 18 month old is just starting to walk now but very unsteady and prefers to crawl, been walking for a couple weeks but Just goes back to crawling. I'm worried he is behind with other stuff too, he only says about 4 words, doesn't follow any instructions, doesn't do role play like other kids his age do, I take him to this class and they're always trying to get him to brush the teddies hair and teeth etc but he just prefers to fling stuff, he doesn't really play with toys, Wont build blocks or push a car around. He doesn't point at all like I see other kids do. I'm just really worried there might be something wrong with him. I keep trying to do these things with him but he has no interest.