Amy and Steve Harmon have found success by urging their 2-year-old son, Nathan, to use his child-sized potty as soon as he gets up in the morning and every two hours throughout the day.

Based on Nathan H. Azrin’s book “Toilet Training in Less Than a Day,” the woman who is called the “Potty Whisperer” trains parents as much as she teaches the toddlers. Her No. 1 rule for ...

For some parents, the thought of potty training is something they may try to push to the back of their minds for as long as possible, but potty training — sometimes referred to as toilet ...