Ds1 is 5.8 and seems to be getting progressively sillier. Examples of this are saying silly words (willybooly, bumwackers etc) and finding it hilarious, and pulling really stupid faces, which, although I know he is just playing, I find really hard to be patient with. He seems to think that me and dh will also find this stuff funny, when actually it is just really irritating.
Are your five year olds like this, or has mine got a problem?