Baby's hair falling out

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Ds is 1 month old and was born with thick blond hair.
He's now totally bald. Is this normal and will it grow back?
I've heard of babies rubbing hair off the back of their head where they lay on it but this is all over.

Yes that's normal.
It will grow back - might not be blond though.

Totally normal. DD was born with tonnes of straight dark hair but bald by 3 months. By her first birthday she had blonde curls!