J.B.
Mine hit his head pretty hard on concrete so I googled this. It said to look for excessive sleepiness, inability to wake up, vomiting, and I think dialated pupils. There may have been more signs but I don't remember. I also called my dr and they gave me signs to look for, but I think it was the same info I found online, so I say try looking it up. My son never had any of the symptoms of concussion so I moved on. My friend's daughter fell out of a shopping cart right on her head and they took her to the dr and she was totally fine. I know freak things happen but I think we are more aware of the random things that do happen bc of all the info on the net. Most times everything is just fine. Best wishes:)