Board Thread:Questions and Answers/@comment-159.118.243.29-20150812231800/@comment-25784202-20151017190352

It's realistically possible to be an OB/GYN, maternal-fetal surgeon, and geneticist. Some OB/GYN residencies have incorporated medical genetics into the program since genetic screening and reading is common with pregnancies and amnio procedures. Fetal surgery is sub-specialty of maternal-fetal medicine which is sub-specialty of OB/GYN, so a dedicated OB/GYN career can lead to that.

But to be a neonatal surgeon, one has to go through gen surg residency and peds surg fellowship.

The writers made it ambiguous exactly what she did first or if she did some fictional hybrid residency that allowed her to do both gen surg and OB/GYN at the same time. In GA, she was taught under Richard, but in PP, she talks about her residency and subsequent flashbacks doing OB/GYN stuff.