I started PT my twin girls about 6 weeks ago (they were 2.8) Twin 1 started off really well with no accidents after the first few days for about 3 weeks but the last 3 weeks she has done every poo in her pants!!! twin 2 begged for her nappy back on after 2 days and I let her as I was no good and helping them both at the same time. I am now strting to think of trying with twin 2 again as I winder if this would help twin 1. I follwed the gina ford book and as I said the first couple of weeks went to plan but we are not a good advert since. I would certainly continue with the "successful" twin and maybe let the other twin go back to nappies. If you want them done by after xmas you still have plenty of time.