This is very common at this age and you do not need to be too worried yet.It would be worthwhile trying a star chart reward system and see if this helps. Stick a star on a colourful chart for every night that he does not wet his bed. When he gets 3 stars in a row he gets reward, something small but something he really likes. Now move this up to 4 nights in a row, then 5 nights and so on until he is going for weeks without wetting his bed. You need to explain this system to him so that he fully understands. He is still too young for medicines to treat his bedwetting [known as enuresis] but when he is 5 years old he can be treated.
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