Nocturnal enuresis is a fairly common problem in children. Especially who have a deep sleep. What steps you have taken helps. But if it is not enough then we have oral medicine and Nasal sprays. We also have special alarm beds which help a lot of children.
Next Steps
Visit a Pediatric urologist. he may start you on Nasal sprays or oral tablets of Anti diuretic hormones or oral tablets of Anti cholinergics.
Health Tips
Treatment takes a while to show improvement and needs to be sustained for a few months before it shows lasting effects. Also I would recommend an ultrasound KUB to rule out any underlying pathology.