Shortly after your baby flashes you his first gummy smile, he'll likely melt your heart with his first laugh. "This important social milestone is usually achieved around 4 months, but some babies laugh as early as 2 months, and others much later," says Jennifer Gardner, MD, a pediatrician and founder of the Healthy Kids Company. "And it's important to keep in mind that the laughter of a baby usually starts out as a squeal and a smile, not a hearty belly laugh!"
Babies typically first "laugh" in their sleep, so, unbeknownst to you, this adorable new trick might be missed the very first time it happens. But don't worry. There are plenty of ways to get -- and keep -- your little one giggling. And once you discover the, often random, thing that cracks your baby up, neither of you will be able to get enough!