Teachers in Switzerland are concerned about the number of students wearing diapers to school because they haven't been properly toilet trained. Some children have become so used to wearing diapers that they lose interest in transitioning out of them. The average age for potty training is between 18 and 24 months, but many parents are delaying it. Experts warn that this sends the wrong message and places a burden on teachers who end up having to change soiled diapers. While this problem is mainly occurring in Switzerland, similar reports have emerged from Buffalo, New York. However, some children with medical conditions may have limited options for using the toilet, resulting in the use of diapers. Parents should look out for signs that their children are ready to transition to using the toilet.