DS is one week old. Just now DD was sitting with him balanced against her legs, accidently she opened her legs and his little head slipped down between her knees and whipped back. I was right next to her and saw it, it was quite a fast whip of his neck but she and I caught him so he did not hit his head or anything. He did not cry and did not seem bothered although he fell asleep almost immediately after.
I am scared that the whipping motion could cause something like shaken baby syndrome but DH says he was not shaken, it was one movement back and he didn't even cry. DH thinks there is no need to get him checked, I kind of know what he is getting at but I am unsure. What would others do?