Does anyone know anything about fontanelles? I have done some research trying to find out about them but I haven't been that successful. DS#3's fontanelle sometimes feels sunken in, I have asked the doctor about it but he says it is normal for them to rise and fall. I did hear once that if the fontanelle was sunken in that the baby was dehydrated but the health nurse told me that he isn't. Plus he is feeding every 3 hours still and having plenty of wet nappies and lots of drool. Does anyone know why they sink in and is it a bad sign?