Ds is almost 21 months. We've had a potty around for a while and he was sitting on it now and again. He's now managed a couple of pees and a very small pooh (but that upset him!) when I just happened to have put him on it in the evening. He now seems to know when he needs a pee as he looks really uncomfortable, pulls at his nappy and yesterday we got him on it in time and he managed to pee......but he can't actually verbalise it. His language is improving rapidly (has one or two short sentences and lots of words) - should I wait until he can actually say he needs to go or start now? My instinct is to wait but any advice? Thanks