I made the mistake of allowing a child who was not pooping in the toilet wear underwear and I was rinsing it out. I steam cleaned my carpets and furniture twice a month for a year until he was trained. Now any child needs to be fully trained before underwear is worn at my house. It is the parents responsibility to potty train their child, I will take the child to the bathroom during natural breaks throughout the day, so they are used to using the toilet at my house. The rest is up to the parents.