Before the fifth birthday, most children will probably be night trained, but at their own request. The need to stay dry all night must come from deep within, or night training cannot work, because it is a matter of subconscious control. This may not occur until sometime after the third birthday. But night training is also a matter of physical maturation. Some children with small bladders or incomplete neuromuscular control may continue to wet the bed for several more years.
Many normal children wet the bed occasionally even after training.
No parent should be surprised by stumbling on a group of preschoolers examining each other's genitals or giggling in a nervous, conspiratorial way about some bathroom or primitive sexual joke. As with reactions to masturbation, it may be difficult for an adult to avoid showing shock at such a moment. But children at this age already have some built-in guilt and prohibition about this early sexual exploration, and any effort to scold or prohibit them will increase their guilt and lead to attitudes of shame whose permanent consequences can hardly be imagined. Ideally, a self-assured parent can, in a constructive way, ensure that while the children are exploring each other, the things they deduce are accurate and positive. It is important to ensure that they receive adequate support and attention while one parent is caring for a newborn infant.