There is some research to suggest that those with a higher level of oestrogen experienced more heartburn and have hairier babies. Oestrogen is responsible for both increased relation of the oesophageal sphincter and helping bub's hair grow.

My two also had a great head of hair seen on U/S and my heartburn was shocking. This time not so bad and no-one has mentioned hair. However I also think for me this time a tansverse bub is having less impact on my stomach as opposed to my very long children who were the correct way.