Maternal–fetal 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–fetal medicine experts are obstetricians who specialise in maternal–fetal medicine. Doctors that specialise in high-risk pregnancies are known as perinatologists. They work with women and babies to make sure they are safe before, during, and after birth. Pregnancies that are high-risk aren't usually more risky or difficult than those that are low-risk. The word usually refers to pre-existing conditions or those that arise during pregnancy. Perinatologists can provide more accurate and extensive information about your pregnancy and how it may be affected by pre-existing conditions. They also care for new mothers after they give birth if there was a problem during delivery, such as an infection or excessive bleeding.