I think you mean EFBW, the estimated fetal body weight from the ultrasound. My doctor said its just an approximate weight of the baby based on scan measurements. Its an estimate so the actual birth weight can be a bit different, dont stress over small numbers.
I tracked this in every scan, its the estimated fetal weight. The app and report both showed it in grams against a percentile. Just ask your gynac to explain your baby's range, they read it best.
Yes its the baby's estimated weight on the scan report. They use it to check if baby is growing on track. Mine was a little off the average and baby still came out perfect, so dont worry too much.