I potty trained myself at age 1.5. when my parents got divorced, they found the left over diapers I had and I asked if I could wear therm [around age 4] and I got to. That's when I figured out I liked diapers a lot.
I don't think I was potty trained to early. I starting potty training at 3 1/2 but. Still had complications for the longest time so wearing pampers never got old for me.
I do believe a child can be trained to early. And again every child is different. The old concept of your child needs to be trained by two I thick is a butch of crock.