my grandson, 15 months, was pushed of the side of a toddler chair and hit the back of his head on the floor. He cried a little but then seemed fine. Drank his milk was put down for his nap about 1 hour after hitting his head. When he woke up, he had a little blood in both nostrils. He seems fine, running around, playing with his toys, every thing like normal. He does not have a bump on his head. Should I worry even through he is acting normal?