I had my 20 week scan today and they spotted that one femur was significantly shorter than the other. I was lucky and saw a consultant this afternoon who confirmed this opinion. He thinks that there is no other abnormalities, and no indication of a chromosomal problem but is referring me for a fetal echo to help reassure me. He offered an amnio but reiterated that he felt there wasn't any chromosomal problems. Does anyone have any experience of anything similar?