Maternal–foetal medicine (MFM), sometimes known as perinatology, is a subspecialty of medicine that deals with the health of the mother and foetus before, during, and after pregnancy. Maternal–foetal medicine experts are obstetricians who specialise in maternal–foetal medicine. Prenatal examinations, treatments, and procedures could all be performed by them. They serve as a consultant for low-risk pregnancies and as the principal obstetrician for high-risk pregnancies. They may work closely with paediatricians or neonatologists once the baby is born. Perinatologists help mothers with pre-existing health issues as well as pregnancy-related difficulties. A consultation with a maternal-fetal specialist may be required for expectant mothers with chronic diseases such as high blood pressure, drug usage during or before pregnancy, or a diagnosed medical condition. Women who are having trouble conceiving may also be sent to a maternal-foetal specialist for help. Pregnancy problems can occur at any time during the pregnancy. A maternal-foetal specialist may meet with the patient on an as-needed basis or become the primary obstetrician for the duration of the pregnancy, depending on the severity of the issue. Maternal-foetal experts may follow up with a patient after delivery to monitor any medical issues.