i m a professional potty trainer. reporter: enter samantha allen, a new york city potty trainer, who says she can get the job done in just two days. how do you do it in two days? i create as many opportunities for practice as possible. and i choose a good reinforcer. it doesn t matter if the child likes to be thrown up in air or if it s candy. reporter: marissa and doug regal tried training their 4-year-old son for months. you re frustrated. you re annoyed. why call samantha? made sense to call somebody to help us put the knots together quickly. reporter: how does samantha do it? she starts giving ethan lots of liquids. here, drink. reporter: then sets the timer to buzz every 30 minutes. that s it. ready? reporter: this routine plays on repeat again and again until the child can finally go on their own. but a service like this doesn t come cheap. a two-day session will run you a whopping $1750. ....