How much can your bladder hold?

Adult -> 5 - 600mL. (17 - 20 oz) calculation for children is to add 2 to their age in years ; express it in oz. Thus normal bladder volume for a 5-year-old is 7 oz or 210ml, 12 oz or 350 ml for a ten-year-old. Teen-agers have an adult size bladder. Full-term newborn babies have about a 50 - 60 ml bladder capacity, just about 2 oz. Of course some adults can stretch their bladders to hold a liter.