How is a one-year-old supposed to act? You may worry when your child can't sit still in a restaurant, but that is perfectly normal for a one-year-old. You may worry when he lies in his crib for an entire hour babbling to himself and playing with his feet. But that, too, is entirely normal. Rest assured, from quiet to loud, from brave to frightened, from calm to moody, most of the behavior you'll see this year will fall into the “entirely normal” range.