My daughter didn't really laugh until she was 3.5 months, she did laugh in her sleep since she was 2 months, but out loud didn't happen til later. I was so excited I made her laugh I recorded it & called her daddy to let him listen.
My Lily bug has been laughing in her sleep since birth. It freaked me out at first, because I couldnt tell if she was awake. She sleeps with her eyes open lol! This week I was eating yogurt and said mmmm yummy thats good! and she busted up laughing, I mean laughing hard! I tried to record it, but she wouldnt laugh out loud like that again haha
The first time she laughed in her sleep startled me but then I realized she was laughing I laughed and she did it again it was funny. I bounced my daughter gently on the bed while saying boing boing she thought it was funny and kept chuckling.