The main responsibility of a perinatologists, also known as a maternal-fetal medicine specialist, is to treat, monitor and assist pregnant mothers through high-risk pregnancies. This includes high blood pressure, early labor and bleeding. They're also able to identify birth defects and then recommend necessary treatments to support your baby before he/she is born. Other reasons you may need to see a perinatologist during your pregnancy include diabetes, problems with a previous pregnancy or carrying twins. Having completed OB-GYN training, they're experts on the female reproductive system with additional specialized training in un-routine pregnancies. So, whether you know you're at risk going into your pregnancy or problems arise unexpectedly, perinatologists can help you.