K.S.
C., with all of my kids, they started potting training themselves way before *I* was ready. It seems today, that moms compete for how early their children are trained. And, even in the "old days"...because my mom cant stand that my kids still wear diapers at 2!!
I used to teach potty training, and my personal opinion, is not to push anything and keep them in diapers as long as you can. Of course, once they start wanting (and insisting) on going in the toilet, then you are sort of stuck getting pull-ups (expensive and not very absorbent.)
My rationale....as long as they are not fully ready..and physically can not hold it, it's more of a hassle then it is worth. It's a horrible feeling, to be half way through your grocery shopping, or somewhere without potties available, and have your little one start wiggling in their big kids pants....and they are too young to physically hold it for long.
So, when they ask, take them to the toilet, but just know that their body physically can not "hold it" for very long, and the earlier they are in big kids pants, the more accidents you are likely to have to contend with in the real world.