Our 3.5 year old looked like she'd train earlyish at just before 2, showed real interest etc. She made an excellent start for a couple of days and was even dry at night but then lost all interest and we assumed she wasn't ready and so put her back in nappies to try again later.
Due to various big life events this later only really came just before she was 3, as she had a new sibling to adjust to among other things and we wanted to do it one at a time.
She trained really well, then had a little regression, then went months without an accident of any kind including on holiday with long car journeys this summer.
A few weeks ago she had a poo accident when I think she was really caught unawares, but every day since almost she has done a poo in her knickers and now quite often wees too. I'd read here that this can happen with constipation when they can't help soiling, but I really don't think this is the case. In the evenings if I'm doing their bedtimes on my own she will come and tell me while I'm settling the baby that she needs a wee or poo in time, and will then produce one on the toilet accordingly, but during the day most of the time she will choose just to go in her knickers and then afterwards say "sorry, next time I'll tell you"
She's been back at preschool for two days since the holidays and had one wee accident.
When it happens I try not to give it much attention and encourage her to clean up herself and then I help. I think it's telling she'll come and interrupt me when I'm with the baby, and I make a real effort to have special time with just her everyday, but I'm really at a loss with the toilet training.
It's really hard because I have to take literally five changes of clothes everywhere and although I try to I ignore it, I know that relatives judge my parenting.
I've thought of reward charts but think if we use them she'll expect a reward for everything. I feel like if we get it right for just one day she'll carry on as she's very habitual.
Otherwise she's a delight most of the time so I just don't understand it!