The stage of human development from the two-cell stage until about nine weeks after fertilization.

A hallow, spherical structure made up of about 50-100 cells, formed when an embryo divides and grows.

The stage of human development from the third month after fertilization until birth.

The process in which the blastocyst attaches itself to the wall of the uterus.

The process of becoming pregnant including fertilization.

Medical care received during pregnancy.

A doctor who specializes in pregnancy and childbirth.

One of three periods of time that divide a pregnancy. Each period is approximately three months long.

A nurse who is trained to deliver babies.

A fluid-filled bag of thin tissue that develops around the embryo.

The structure that holds the embryo to the wall of the uterus.

The cordlike structure that connects the embryo and the placenta.

The work performed by the mother's body to push the fetus out at the end of pregnancy.

A period of adjustment for parents and their newborn during the six weeks after birth.

High-frequency sound waves used to create an image of a developing fetus.

A surgical method of birth.

A prenatal test in which a piece of the developing placenta is removed and tested for inherited disorders.

A prenatal test in which a small amount of amniotic fluid is removed and tested for abnormalities.

A condition resulting from the implantation of the blastocyst in a location in the abdomen other than the uterus.

A serious condition during pregnancy characterized by high blood pressure, swelling of the wrists and ankles, and high levels of protein in the urine.

Diabetes that develops during pregnancy.

A newborn weight of less than 5.5 pounds.

The delivery of more than one baby-for example, twins or triplets.

The delivery of a live baby before the 37th week of pregnancy.

The expulsion of a fetus that has died after the twentieth week of pregnancy.

The death of an embryo or fetus in the first 20 weeks of pregnancy.