My daughter is 12 years old, 5 feet tall, and weighs a little over 100 pounds. is she fat or overweight? if so, how can she lose some pounds?

Sounds fine: for her height and weight, check the link below for her growth chart, best way to keep her shape and not gain extra pounds is to indulge in any physical activity, better be outdoors, or indoors for 30 minutes a day, in addition to the healthy diet, best wishes to you both. https://www.cdc.gov/growthcharts/data/set2clinical/cj41c072.pdf

Fat or overweight?: My daughter is 12 years old, 5 feet tall, and weighs a little over 100 pounds. Is she fat or overweight? If so, how can she lose some pounds? ANS: you did not give your ethnic background. But she is probably not overweight as BMI is 19.5 and overweight is ≥ 25. So ask your Dr to review her growth chart and discuss with her and with you.

She isn't overweight: Pediatric BMI is calculated by exact age (years and months), and overweight is not defined at 25 as it is in adults. Rather it is defined as 85-95th percentile of all girls of that age. At 12.5 years of age, the BMI of a girl at 5 ft tall and 100 lbs is 19.5, placing the BMI-for-age at the 64th percentile for girls. This is a healthy weight. Overweight is reached at a BMI-for-age of 85%.