Kidalog/Baby Love Products, Camrose, Alberta, Canada

According to statistics quoted by Kimberly-Clark there are 700,000 children who are night-wetters. These large numbers must mean that this is normal for children.

36 months is the average age of a child to be toilet trained during the day.
Bedwetting almost always happens for physical reasons; rarely for psychological ones. Genetics play a large role--if other family members had a tendency to wet at night, a child may have inherited that tendency. Some children are very deep sleepers so they do not wake up when they need to go to the bathroom. Some children have a small bladder so cannot go through the night without needing to empty it. Some children produce more than the usual amount of urine at night. Most kids outgrow bedwetting when developmentally ready. (10% of 7 year-old children are night wetters; 1% of 16 year-olds are night wetters.) Bedwetting alarms or anti-diuretic hormones are used by medical professionals when treatment is necessary.
Child Health Clinic
Misericordia Hospital, Edmonton