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Why is Caillou bald?

Caillou is a four-year-old boy who does not have any hair. On the show, he appears to be healthy and it is never explained why he has not grown any hair.

Photo courtesy of PBS Kids

bessa bessa 6 years
My 2 1/2 year old is almost that bald and her daddy was bald until he was 4. Maybe he's just very blonde!