How much is a 5'5 12 year old girl supposed to weigh?

Between 80-95 pounds would be around average for a girl, but for a boy it would be between 85-100 pounds ( boys tend to eat more at this stage ). But it also depends in the kind of build the 12 year old has: if the Hilda is more lean then he or she can be 4-7 pounds less, but if they have larger build like being big-boned then they can be 4-7 pounds more. Hopefully this answer will benefit you.