Thanks so much for the guesses ladies! In the 3rd pic I see something bright white angled upward next to thigh but not sure a nub would be that far back on the baby? Or is that something else showing up? I don't know what to think! My hubby thinks that is the nub & it is more parallel to the spine than not. I was hoping for a good sense of what it was so I could prepare my heart either way.