DS1 (18 months) now squats when he is doing a poo in his nappy and holds the front of it when he is weeing. He knows what wee wee and poo poo mean and I have had a potty lying around for weeks. I have told him the potty is for wee wee's and poo poo's but still nothing. I know he is a little young but what with his terrible nappy rash (another thread) I thought it might be time to start but don't know where to go from here?