WAIT THAT MAKES PLENTY OF SENSE. Including in the way where River could easily conceivably have a half-Time Lord child, SINCE IT LOOKS LIKE SHE HAS IN FACT BANGED THE DOCTOR IN HER PAST. The only flaw in this is why she had no reaction to the little girl herself. Maybe she thought she'd lost the baby? IDK this is a bit convoluted too but I like it much, much better.