I had terrible heartburn with DD and she was a hairy little gorilla, DS1 it wasn't too bad and he was only a little hairy, and DS2 it was a bit worse than with DS1 but not so bad as DD and he was in between DD and DS1 with hairy-ness!
I have actually read an article which says there really is some correlation between beartburn and hairness of babies. Something to do with the hormones needed to grow hair or something....I can't remember where I saw it now though