DS is 4.5 and still pulls his trousers down to stand up and wee (and he does it quite well). I've realised that men just unbutton their flies to wee so I'd better teach him, although I'm not sure his fingers will undo / do up the button as his trouser buttons are quite tight.
What age did you teach your DS to do it? I assume I need to teach him before he starts school in the autumn.
There aren't any men that can help either (he doesn't see his dad and we aren't close to any male relatives) so DS can't watch how it's done.