hi.. my son is about to be 11 months... I don't know why he is not getting confidence to crawl, stand up or try to do physical activities except sitting & rolling. As he comes in a crawling position, he gets worried maybe and goes back to sitting or lies down & swims. He doesn't try to stand or crawl or move forward fearlessly, not even tries to reach his favorite toys if he realizes that he has to crawl and go. He would max swim.