i would be slightly worried if i were you. i don't remeber much from when i was three but i do remeber getting hit in the testicals with a baseball when i was about six years old and that was very painful.
when do boys start to have sensitivty in there privates? son is 3 and shows no sign or reaction if he got hit. he is in underwear. his sister hit him by accident in his private and he had no reaction. his dad has asked him if he hurt his peepee but he just says no and that was when he was on his bike and slipped on to the middle bar on the bike. should i be worried that he has no sensitivity there or is that normal?