Concussion in toddlers

C 🖤

What should you keep a check of when a toddler hits their head hard, aside from the usual?

My son fell backward earlier today and hit his head really hard against the corner of a doorframe, and he seemed ok afterward (a minute of crying and then running round and playing etc as normal) but I’ve just mentioned it in passing to my dad and he’s freaking out saying I should have taken him to the hospital 😑