Femur

One of my twins was like that. He’s just short 🤷‍♀️ he’s otherwise perfectly healthy

Ours was showing on the smaller side but he actually has long legs!

I’m currently 26 weeks and they said this at my 20 week scan baby was 12th centile and femur 3rd. Now having regular grow scans (every 4 weeks). At 24 weeks femur was slightly smaller but had caught up with rest of growth (only behind by 2 days)