Until this week, I was really regretting that I didn't invent a new, easy sign for toilet. The whole wrist rotation, thumb between 2 fingers thing was too hard for my son til just now. We have used that sign since birth, and then the words "pee" and "poop", and different cue sounds for whichever one seemed likely to be happening. Last week my son said "poop!" and then did, and this week he says "pee!" and does, and yesterday he signed toilet for the first time. I feel strongly that he would have signed an easier sign for it sooner, but by the time I realized that I had set him up for a signing challenge, it felt too late to change since he clearly recognized the word and sign together.