What problem causes caillou to be bald?

Answer 1

Caillou is bald because the creators wanted Caillou to be relate-able with all children.

They also wanted to show that being different is normal and they didn't want him to be a specific way that children would think is normal.

Answer 2

it's because he has problems. he hasn't developed hair even at the age 4. who knows how old he is now...
I'm guessing not, because he's like 4, how it says in the theme song.he's 4, and he still didn't grow any hair yet.
He has lymphoma.

Answer 3

The word "Caillou" in Latin, means bald.