Found out yesterday at 27+4 that everything was okay but her legs are on the short side. Dr. Of…

Found out yesterday at 27+4 that everything was okay but her legs are on the short side. Dr. Of course has freaked me out saying its could be a sign of down syndrome but all my test came back fine. Has anyone else had this. I'm worrying myself here. Father is 5"4 I'm 5"3 could she just be a short baby.