I would actually, I would be just as concerned because neither are particularly normal for someone who is shorter than 5 ft.
60 pounds is particularly astonishing because 80 - 90 pounds is the "normal" (people weigh around 70 pounds and are perfectly healthy hence the quote marks on normal) weight range for people who are in the 4 ft 7 to 4 ft 11 range, I believe. I guess bone mass could have something to do with it.
Oh well, as long as your healthy.