potty mouth

Since potty training Noah he seems to enjoy talking about bodily functions and body parts. ( I won't even mention what he referred to looking at the starts and attempting to point out venus.) I often have to explain to him that we don't talk about certain things. I also often have to explain to Zac that we don't talk certain ways around Noah now that he is repeating many heard things. The other day Zac commented that he really had to pee. Noah turned to him and said "daddy we don't talk about pee pee and poops." You tell him Noah.....who's the 3 year old?