Anxiety is a new parents constant companion. Youre probably wondering if your baby is eating too little, sleeping too much or even crying too often. And way up there on your list of concerns is, no doubt, development. Should your baby be smiling by now? Crawling? Waving bye-bye? Like people, babies are individuals. Some will do things better, earlier and more easily than others. But knowing what milestones to look for at different stages can help put your mind at ease, or spur you to find early intervention programs if need be.