Most baby’s have dry patches on their skin after a few days, especially if they’ve been born past their due date.  It’s not a problem at all for your sessions though, I’ll use posing to minimise how much is on display and then editing to reduce (if not remove) the dry patches. I don’t actually over-process a baby’s skin in your finished images as I don’t like images that make them look waxy and unreal.  They’ll still have their skin texture which may include some little flakes and dry spots but then that is part of who they are at that moment in time.