Tonight my dad came over and was holding and playing with my 5monthold daughter. He started jostling her in his lap and got a little too bouncy for my comfort. She looked fine and didn't cry or get upset, and I stopped him after I realized it was too rough probably after 3 "jostles." She has very good head control for her age but her head did wobble a little with my dads play. I'm really worried this could lead to shaken baby syndrome or something. He felt really bad when he realized he was being too rough... I know it won't happen again but I'm worried about this one instance. She is acting fine abd this happened about an hour ago. My husbabd seems to think she's fine and im just worrying too much. What do you all think?