If Baby becomes comfortable on his tummy, after some weeks he'll start to try to move around. He may first roll, push back, and then possibly pivot around his belly button. Then he tries to move forward. He becomes interested in things he can see that are out of his reach. As his arm reaches out, his foot on that side pushes. As he slides forward on his belly, his weight shifts to his opposite side allowing him to reach out his other arm which triggers the leg on that side to push.
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