Joke

I have a 4 year old son and a 3 month old daughter. A couple weeks ago we were in a waiting room waiting for my mother in law and the receptionist was talking to my son. She asked him if he helped change his sister’s diapers. He responded, "No, they're yucky, Mommy does that."
Not the funniest thing, but then she asked him if he helped feed his sister, to which my son replied in his best 'duh' tone, "No, I don't have boobies!" At which point the receptionist nearly fell out of her chair.