How likely is it that I'll be able to have my girl potty trained by 2 y and 4 months? I have my eye on a Montessori school that will only accept kids that are potty trained. My son will be 4 and I need them to be in the same school for logistics reasons. My son potty trained pretty easily just shy of turning 3, but I hear girls are likely to do it earlier? Experiences? She is 19 months now and I have done nothing with her in the process.