schools are sending home report cards and not sitting well with students or their parents. here's abc's bianna golodryga. >> middle schooler -- has multiple report cards. the one concerning her academic grade, and this one concerning her weight. >> i am scared because i am taller than a lot of girls at my school and also bigger than a lot of them. not incredibly skinny. >> reporter: fitness grant lucy received from her school is part of a growing initiative to track students' body mass indexes or bmis. schools in 19 states, arkansas to illinois, take part measuring students at annual weigh-ins and sending reports home to parents, indicating whether a child is in the green, healthy zone or red danger zone. pediatricians say bmi readings are helpful in combating childhood obesity. >> right now the best measurement we have to determine whether a child's weight is healthy or unhealthy.