There are few things regarding my daughter that give me anxiety as much as developmental milestones. Why, though? Why did I worry so much about when she was able to lift her head, when she would roll over, or when she sat unassisted? She ended up doing all those things, at one point or another. And why do I worry now that she hasn’t started crawling and is 7 months old, and over-analyze the way she uses her hands and how she plays with her toys?