My DD is 18 months and tells us when she needs a poo. She generally won't do it until her nappy is off. Should I try getting her to poo on the potty as a first step to potty training? She doesn't tell us when she needs to wea so I don't think we're ready for no nappy yet. Has anybody done potty training in this gradual way? We're expecting twins around the time of her 2nd birthday and have read that it would be a bad time to start with all the change.