At first it is important that the one who wets the bed urinates regularly by day. When you drink 6 to 7 glasses per day, it is normal that you urinate about 5 to 6 times by day. It is quite simple to monitor it during 3 days. If the pattern is deviant by day, it is the best to consult with your family doctor.
When there are no (more) problems by day one can try to start with a specific treatment to end bedwetting. You would be well-advised to contact your family or school doctor.
Before you start with the treatment, your doctor will check for other causes. By young children one starts usually with a treatment only when the child experienced it as a problem and wants to assist the treatment. Only then you have a chance to complete the treatment successfully.