 [ Symptoms ] what is healthy weight for 55 tall 8 year old girl my daughter seems overly thin and also has dark circles under her eyes no matter how much sleep she gets her dr hinted that she may be underweight at 62 lbs but nothing more she eats very well and in large quantities yet does not seem to be gaining much weight though she is growing taller is this normal or is there something i should watch for [ Disease ] she is taller than the average 8 year old girl in the 90th percentile a matching weight in the 90th percentile would be about 80 pounds taller girls do look thinner but before we would determine if a child was underweight under nourished etc i would need to review their nutritional state family history etc puberty    a few years down the road    tends to change weight and height a great deal so in the meantime just have her pediatrician carefully monitor her growth