My little guy knows how to use the potty as we started doing EC with him from 9 weeks old. He's recently entered the next phase of cognitive development and now won't use the toilet at all. Even though he hasn't forgotten, it is as if his mind is having a hard time managing his need to have control over when he goes with his body's need to go if that makes any sense.

I've had to just back off and accept that as he continues to develop and mature that things change. I always knew that there was going to be some transistion between my offering and him being potty-trained. I still have no idea how it will play out but after 14 months of success I'm having no pottying successes and lots of poopy diapers (where I used to have one a month!) Eventually he will get there; synchronizing need, want, action, anticipation, etc. I can't make it happen for him.

Here's some info from Diaperaps about Potty Training that I reference now and again. We use their training pants on Jonah:

http://www.diaperaps.com/home/dp1/pottytips_main.html