You are extremely lucky to have a SON that is potty trained at 23 months. Most girls don't potty train that early, and most boys are 3-3.5 yrs. I think that what is happening is that he is still not 100% sure of the cues that he has to go. He gets too busy with playing and he ignores the cues that he has to go. The only concern that I would have is he ignoring the cues to go poop as well. If he is this could get him into some stool holding and that may not allow him to hold as much urine in his bladder as he normally does and he will have days where he repetetively has dribbling. Make sure that he is pooping at least 1-2 times per day. Watch his dairy and push the fiber in his diet. If need be take time out to have him sit and try to go as well. I don't think that you have a problem, and he is doing very well at this point. Remember most boys don't mature their bladders until 8-9, and they are very busy, so encourage him to take time to go and stay there until he is finished. Good Luck