Sorry for multiple posts on this but I'm still so worried...
Held my baby in the crook of the arm fully supported after feeding. So he was lay down head in my elbow crook.
He was crying as he was tired so started to play to cheer him up.
And was squeezing my arm sort of towards me to do that jiggle/bounce thing you do with them and saying boogabooga in a silly voice. Anyway he was half giggling half still crying so I did it a bit more vigorously. Quite a lot more and he giggled. I'm not sure if it was more his body moving or his head but he was supported at all times.
Question is will that have damaged his little brain?! His head was wobbling like a bobble head side to side a little but fully supported. I was definitely rough housing him but fully supported as I say, it just was quite a vigorous jiggle/shake/bounce not sure what the technical term is for the movement!