Question: what percent of 2 year olds are potty trained?
Answer: But over the last few decades, the age at which toddlers become diaper-free has been creeping upward. In 1957, 92 percent of children were toilet-trained by the age of 18 months, studies found. Today the figure for 2-year-olds is just 4 percent, according to a large-scale Philadelphia study.