I always just assumed they were, but DP is really alarmed that DS gets them because he never had them as a child and no children in his family ever have done. (He's not DS's blood father.)
My ex (DS's dad) used to get nosebleeds, as an adult, but there's a chance he may have been using cocaine at the time this was happening, so I don't know how reliable that is.
DS is 3 and he's had 2 on 2 separate occasions, and an additional small one during the night, and one when he fell over and bashed his nose on a (vinyl) floor.
Should we be worried? I'm not but starting to wonder if I'm perhaps just a lax parent...