I think my son has booby issues

Today Adrian was getting ready for church. He was almost dressed except his shirt. It still needed to be buttoned. I hear this "MOM, look at my big boobies!" I looked up and started laughing. Ok, he had sucked in his stomach and was showing his rib cage. He was holding the bottom of his rib cages, yelling "I got big boobies". LOL. I had to nicely explain to him that he can not say things like that in church. Oh brother......what am I going to do.....he's not even 4 yet?