OK DH is back home now (as people who are my friends on facebook know!)
The doc checked her out, and doesn't know why her fontanelle is sunken, she's not displaying any other signs of dehydration - lots of spit in her mouth, eyes are bright, and generally a very happy healthy baby. He said sometimes its the shape of their head that makes it go sunken, but her head is perfectly round so not that reason either.
SO he doesn't know why its sunken - just "one of those things" and just because it is a sign of dehydration doesn't mean she is dehydrated - she's fine.
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