C.O.
Had the same problem with my son last year when he was 7. He was so embarrassed and upset. His undies would be leaked on even though he went and made sure to empty his bladder. After a few trips to the regular doctor and testing him for bladder infections & diabetes. I finally got a doctor to listen to me and he sent us to a pediatric urologist. They did an x-ray (or maybe it was an ultrasound) and found out he was constipated and blocked up. She said that even though he is pooping regularly it's not all coming out. This is causing pressure on his bladder which in turn makes the muscles that hold your pee weaker and pee leeks out. We ended up having to give him miralax to soften it up and he went back a few months later after no more leakage and she said to keep doing the miralax but cut back. He's been off it for a few months now and we've had no more problems.