According to Amanda Spielman, chief inspector of Ofsted (the Office for Standards in Education, Children's Services and Skills), toilet training is not something that you can do in a few days. The issue is that children nowadays are potty trained at an older age because parents have become too busy to teach them how to use the toilet before starting school and are increasingly reliant on nursery staff to do such a basic job. One bad consequence, for example, is that these neglected kids are at risk of being teased by their classmates.
In the last century, toilet education used to be done by parents, but this responsibility has been weakened as more kids enter formal childcare. A recent report revealed that teachers lose million hours per year teaching preschoolers how to use the toilet. Spielman highlighted the increasing number of four-year-old children lacking both basic hygiene and language skills. It seems that, in the digital age, a lot of parents do not understand the crucial importance of early education at the most basic levels.
Beginning Reader (Wikimedia Commons - w/Effects)