My sons umbilical cord stump fell off last week there was a little bit still left. This morning when I was changing his diaper and was folding down the top part of the new diaper there was a little blood on the diaper. I touched his belly bottom and it wasn't continuing to bleed so I'm not sure if it's infected, if I need to bring him in, or what I need to do? He just had a bath last night? Idk if that caused irritation? HELP??