Some of the causes of bedwetting are;
Constipation (when the bowel is full of poo) is a common cause, especially if the bedwetting starts after a child has been dry at night for a period of time. A full bowel can press against your child’s bladder making them feel like they need a wee or stopping them from holding as much wee as usual. Bedwetting can be a sign of constipation, so it's good to think about this.
Signs of constipation include if your child is;
Infections in the wee can make the bladder misbehave. Features that might suggest a urine infection include;
Some children find it hard to wake up when they need a wee. It is not because they are sleeping too deeply, it is because their brain doesn’t recognise the signal of a full bladder. If your child has the following it might suggest they are sleeping through wetting;
Vasopressin is a special hormone that is made at night that tells kidneys to make less urine when we are sleeping. Some children don’t make enough yet. Vasopressin so their kidneys make lots of dilute wee, too much to fit inside their bladder. If your child has the following it might suggest they have reduced Vasopressin;
Some children wet the bed because their bladder is too small to hold all the urine they make at night or it is a bit twitchy and leaks urine, this is called an overactive bladder. If your child has the following it might suggest they have an overactive bladder;
Times of stress and worry may restart bedwetting, for example;
You will be asked questions about your child’s diet, bowel habit and general health. Your child’s growth will also be reviewed. Most of the time, tests are not needed. If a urine infection is suspected, your child will need to have a sample of their urine checked. You may be asked to complete a diary to monitor the number of daytime drinks, frequency of bedwetting and frequency of bowel movements.
Contact your GP surgery, health visitor, or school nurse if you are concerned.