One of the classic regression scenarios in pediatric enuresis is the dry four-year-old whose new baby brother arrives, and within a few weeks the wet beds are back. This is one of the cleaner examples of secondary enuresis, where a child who has been reliably dry for six months or more starts wetting again, and it has a real psychological explanation behind it.
What is actually happening
The child who has just been displaced by a sibling is processing a major change to their place in the family. The attention that used to flow to them now splits, and from the child's perspective the split is not even. The baby cries and gets picked up. The baby is fed in someone's arms. The child watches all of this and registers, accurately, that they are no longer at the centre.
Regression is one of the ways young children deal with this. They go back to behaviours that, in their earlier life, drew attention and care. Talking like a baby. Wanting to be held. Wetting the bed. The wet bed is not manipulation. It is the nervous system reverting to an earlier setting under stress.
What not to do
The instinct to scold or to lecture the older child about acting their age is exactly wrong. The child is telling you they feel pushed aside. Punishing the symptom does not address the cause. It usually deepens it.
What does help
The single most useful intervention is time alone with the older child, with the baby not in the room, on the older child's terms. Even fifteen minutes a day, predictably, with no interruption, can change the picture. The older child needs to know that their parent is still their parent, that there is still a place for them, that the baby has not replaced them. Involve them in the baby's care in age-appropriate ways, so they feel like a partner in the new arrangement rather than a casualty of it.
How long it lasts
Most of these regressions resolve within a few months once the older child feels secure again. If the wet beds continue past six months, that is the point at which I would start treating the bedwetting itself, alongside the family work. The brain has had time to relearn the wet-bed pattern, and waiting longer becomes counterproductive. Explore our treatment plans.