Is 103lbs underweight for a 14 year old girl who is 5'1?

Yes, a weight of 103 lbs for a 14-year-old girl who is 5'1" may be considered underweight according to standard growth charts and BMI calculations. The Body Mass Index (BMI) for this height and weight would be approximately 19.4, which is within the normal range, but it’s important to consider individual factors such as body composition and overall health. Consulting a healthcare professional for personalized advice is recommended.