ds is 2yrs 9months. He's also my 3rd child but my first son and until recently hadn't shown any signs whatsoever of being interested in potty training. I haven't worried as I've been secretly hoping he'd wait until either summer and/or warmer months when it would be easy to let him roam with nothing on. For the last 9 months however he very very occasionally takes himself off to the potty, pulls his own trousers and pullups down and attempts to wee into it (given that there is no adult supervision this normally results in me spending a long time cleaning the bathroom and him wandering with a wet T shirt and a very pleased with himself smile). But then he'd normally refused to go near the potty again for a good few weeks/months. In the last 10 days this attempts have got more and more regular until on Thursday he refused to put the nappy on so I went and got the pants and put those on instead. Between then and bedtime we had two accidents and two successes. The following day he goes to the childminder in the afternoon. I'd warned her what was happening and on the phone she hadn't sounded best pleased but said she'd try. The following morning we had one success and one failure before I dropped him off with his childminder. My dh picked up later at 4.00 and was informed that he'd had one accident and that she couldn't afford for him to have accidents on the carpet with the other kids there and therefore had put him back in his nappies. He's now refusing to wear pants so goodness knows what actually happened.
Until this point I would have said I had the best childminder possible. She's been incredible and my son loves being there but its a little ridiculous if I can't potty train him on Mondays, Wednesday and Fridays!