I recalled an old memory while writing my previous post.

I once visited a friend of mine with my son when he was six months old. My friend had a seven-month-old baby. At that time, my son only said ah-ah-ba, while my friend's baby only said ooh-goo. I found it fascinating to see how every baby makes different sounds. We spent some time together, and when it was time to go home, both babies started saying ah-ah-ba and ooh-goo!

Babies mimic everything, so even the way they laugh might be influenced by the culture that surrounds them.