Is My Baby Smiling, or Does She Just Have Gas?

Now the fun really begins! "At the one-year mark, the baby should be clapping, waving bye-bye, blowing kissing, giving hugs, and playing peekaboo," Dr. Jacobson says.

But remember: milestones are a reference point, not hard-and-fast rules. So try to avoid comparing your baby to their peers, and if you have a concern, stay off Dr. Google and run it by your actual doctor. "The best source of developmental milestones is your pediatrician," Dr. Jacobson says.