She is only 18 months but she removes her own nappy if it is dirty/wet. She is dry for long periods of time <she removed a nappy one morning while I was on the loo and I didn't realise till ages later and she was still dry> She likes to sit on the toilet and even pulls her nappy down while dd1 is on there and waits her turn. But 18 months is too young isn't it? How would you even go about potty training an 18 month old?