Should I be concerned? It does make my life easier that he doesn't need to pee often and he never has accidents, but I worry that there is some signal missing or a kidney problem of some kind.
I think it has to do with the size of his bladder. My 3 (almost 4) yo is that way, he only needs to go about 2-3 times a day (but when he does, watch out

) where his older 5yo brother needs to go every 2-3 hours. They both drink about the same amount, if anthing the little one drinks more.
That doesnt mean there isnt a problem, but if he isnt in pain...the there probably isnt. KWIM. I think its the size of the bladder.