Interesting read on Contractural Arachnodactyly (CA), "fawn calf syndrome" with some pics, see if they compare to your calf. https://www.dpi.nsw.gov.au/__data/assets/pdf_file/0011/336944/Congenital-contractural-arachnodactyly-in-Angus-cattle.pdf If that is what you are looking at then your heifer is a carrier of the CA gene, and the bull she was joined to was also a carrier. As long as you join her to a CA free bull next time her next calf will be fine (but 50% chance it will be a carrier too). | 
Problem with calf legs
