Hi all, we same prob with 3yr old dd who, for some reason, after about 3m of being fine after potty training, decided to poo herself all the time.
i think it was attention, as she has a younger brother who is now crawling, cruising and moving round playing with her toys so she decided to grab loads of attention. we were doing this inadvertanly by telling her off fr pooing, cleaning her up and spending ages telling her to tell us if she needed a poo, f she did any poo like grunting (yes, you all know what i mean ) we were immediately all asking her if she needed a poo, stressing out as she had started nursery (and loved t, so not an issue there), so bascally, even f it was not briliant attention, she was stll getting some attention, rather than none.
in desperation i was trawling old mn posts re this and decided on an old thread that advised to just ignore the issue completely. no asking if needed a poo, ignoring gruntmg noises, if she had a poo just cleaned her up without much chatter, just a 'never mind' comments re the mater and that was it. i thought it would never work, but as dd was pooing herself all the tme, i thoiught might as well give it a go as things can't get any worse, and, it did (fingers crossed, touch wood etc etc, ) so far (3wk +) it's working, so hth's!