average age nighttime trained
Babies urinate around the clock and then at about the average age of 18 months, as the sphincter muscles mature, toddlers will make the transition from urinating around the clock to only urinating during the waking hours as is the case with most adults.
According to a study by the Medical College of Wisconsin, the average age for potty training was 35 months for girls and 39 months for boys. If you feel your child is ready, Dr. Brown suggests putting him in training pants and see what happens. If he has 10 accidents, he's not ready.