My 16mo tells me every time he does a poo in his nappy. My Mum (had 7 kids) tells me now is a good time to try training. He doesn't tell me when he wees but one time we had to collect a urine sample so he had to have a little plastic bag stuck to him inside his nappy. This made it obvious to him when he urinated and he told us when he had done it.... (He was 15mo at this point!) Am I just being lazy by leaving it for now or should I do as my Mum advises?