| A | B |
| Germinal stage | the first 1 to 2 weeks of prenatal life after fertilization, in which the fertilized egg (zygote) migrates to the uterus and becomes implanted in the endometrium |
| Gestational diabetes | a condition characterized by an elevated level of glucose in the blood during pregnancy, typically resolving after the birth |
| Glucose | a simple sugar that is an important energy source in living organisms and is a component of many carbohydrates |
| Group B strep | an infection caused by a common bacterium (group B streptococcus); usually harmless in adults but potentially dangerous in |
| HCG hormone | a hormone found in women's blood and urine throughout pregnancy, and detectable in the blood shortly after implantation of the embryo in the uterus |
| Lanugo | fine, soft hair, especially that which covers the body and limbs of a human fetus or newborn |
| Maternal-fetal care doctor | doctor of obstetrics who has three additional years of training in helping women through high-risk pregnancies |
| Menstruation | the process in a woman of discharging blood and other materials from the lining of the uterus at intervals of about a month |
| Miscarriage | the spontaneous loss of a woman's pregnancy before the 20th week that can be both physically and emotionally painful |
| Morning sickness | nausea and vomiting during pregnancy; potentially occurring at any time of day and common during the first trimester |
| Neural tube | a hollow structure from which the brain and spinal cord form; defects in its development can result in congenital abnormalities such as spina bifida |
| Neuron | a type of cell that receives and sends message for the body to the brain and back to the body |
| Ovary | the female reproductive organ in which eggs are produced |
| Ovulation | the process in which a mature egg is released from the ovary |
| Ovum | a single cell released from the female reproductive organ (ovaries), which is capable of developing into a new organism when fertilized with a sperm cell |