I don't think the big baby one is true, I had horrible reflux with my dd and she was average size born. But she did have heaps of hair- on her head her arms her thighs her back...she was a little gorilla, LOL. I have it again this time too and I expect a hairy baby again!
I have read studies about the hairy thing though that it has been proven to some degree (not every time) and its due to some hormone or enzyme or something that is created when babies have lots of hair! So maybe not so much of a wives tale after all??