A case of the giggles
At around 3 or 4 months, your baby will do something amazing: He'll laugh. Whether it's a lighthearted giggle or a full-blown guffaw, you should take great pleasure in this happy emotion. "Your child's first laugh means he's started to develop a sense of humor," says Dr. Acredolo. "This is a huge emotional milestone -- it signifies that your baby is happy and feels secure."
In the beginning, touch is most likely to bring about laughter, so try lightly tickling your baby -- especially at the end of songs and rhymes. As your baby gets older, he'll be able to tell when you're actually trying to be funny -- whether it's by making wacky faces, blowing raspberries, or playing games like peekaboo.
Feel silly doing this stuff? Don't! "Sharing a sense of humor with your baby is key to a healthy bond," says Dr. Acredolo. "After all, babies fall in love not just with the people who feed and change them but also with the people who make them laugh."
Originally published in the January 2007 issue of Parents magazine.