Bilirubin: Pigment in the blood, urine, and bile that results from the normal breakdown of hemoglobin in the red blood cells.
Breech presentation: Fetal position in which the feet or buttocks of the baby are closest to the mother's cervix when labor begins.
Cervix: The lower portion of the uterus which extends into the vagina.
Cesarean section: Delivery of an infant through an incision in the abdominal and uterine walls.
Chloasma: Discoloration of the skin, often on the face. Also known as melasma.
Chorionic villi sampling: An invasive prenatal test that looks for genetic abnormalities by sampling a piece of the placenta. Usually done at 10 to 12 weeks' gestation.
Chromosomes: The cellular structures that contain the genes.
Circumcision: Surgical removal of the foreskin from the penis.
Colostrum: The milk secreted shortly before and for a few days after childbirth.
Congenital: Present at birth.
Crowning: The point in labor when the head of the baby can be seen at the vagina.
Doppler: A machine that uses ultrasound (sound waves) to detect the fetal heart.
Down syndrome: A congenital chromosomal birth defect that results in mental handicap/limitations and possible physical problems.