My 6 year old accidentally sat on my 12 week old baby. Baby cried briefly but when picked him up he calmed right down. Legs seemed fine and tummy didn't bother him when touched. Few hrs later when changing him, I noticed a rounding spot by belly button and below on right side. It seems harder then left side. No bruising and he didn't fuss when touched it. Thought maybe due to just eating, but also paranoid and worried about accident. Not sure if always been there or not. You have really push n observe to notice. Could this be an issue? He ate, peed, and sleeping ok. No crying or fussing