Some children may benefit from bladder training exercises. This can include things like holding urine for a short period during the day to strengthen the bladder muscles. Also, reducing stress in the child's life can be helpful as stress can sometimes contribute to bedwetting. Make sure the child has a calm and comfortable sleeping environment.
One way is to limit the child's fluid intake a couple of hours before bedtime. This can reduce the amount of urine produced at night. Another way is to establish a regular bathroom routine. For example, make the child go to the bathroom right before going to bed.
You can also use a bedwetting alarm. It wakes the child up as soon as they start to wet the bed. This helps the child to become more aware of their bladder and learn to control it. Also, positive reinforcement is important. Praise the child when they have a dry night.