20 week detailed scan

Megan • Our little rainbow baby girl due September 17"
So today we had our 20 week scan. Everything looks fine and she's a healthy baby. I'm currently 20 weeks and 1 day. During the scan she said the brain measured at 20+3 but said this is prefectly normal. Continuing on she measure the femur bone and told that our baby will be very tall as her legs are measuring at 21+2 long!! Anyone experienced this? Was there baby long. We knew she had rather long legs at the 13 weeks scan but to measure 1 week ahead sounds strange, midwife said it was normal? Just want some opinions from women who have experienced? Thanks!