With my first child, and incidentally the one with the second least hair at birth, I had heartburn from about eight weeks on that required medication to control. When he was born with so much hair, I found myself believing the old tale.
Fast forward to my second child, and I didn’t suffer a single day from heartburn. In the ultrasound just before we delivered her, you could see her long locks waving around – they were that long. She had the thickest, lushest head of hair I’ve ever seen on a baby and still does today at two years old.
My third child had the least hair of the three, perhaps because she was born a week and a half early. I had a couple days of heartburn through my pregnancy with her, but she still came out with a full head of hair.
So in my experience at least, heartburn and hair have no real connection, although it is a nice idea to think of the prize of lots of hair at the end of a heartburn-filled pregnancy.