Talking about poo, bum and willies

[Tillytoes14]

Sorry I couldn't think of a better title, bathroom talk maybe? Anyway my 4 year old son keeps talking about the above things and saying them and giggling, is it a good idea to correct it, or ignore it? I'm hoping he will get it out of his system at home, rather than use the words at school, also his 9 year old brother is joining in with the words, which makes it funnier for his younger brother, is it age appropriate for a 9 year old to be saying these things? Just to say, we don't allow it at the dinner table, only within the house

My lot are years older than yours and they are still at it - ignore (not that it does a lot of good!).

Isn't that just what children do.

Poo bum and willies still funny here, aged nearly 15, sorry...
I wouldn't make too much of an issue of it to be honest. At 4 I think they can understand that it's OK to have a giggle about it at home but we don't talk about these things when we are out / seeing Grandma etc

That makes me feel better Clobbered - fourteen here