The female reproductive system is studied in the medical specialty of gynecology. Gestation, usually lasting nine months or forty weeks, is divided into three trimesters and refers to the period from conception to birth. In the first trimester, the embryo develops all major organs and body systems by week 12. The second trimester from weeks 13 to 27 is usually the easiest stage of pregnancy, though morning sickness may subside. By the third trimester from week 28 until birth, the baby grows and matures its organs while movement increases as discomfort rises in preparation for delivery.

1. The Female Reproductive SystemBy: Kathryn McLaughlin

2. GynecologyThe medical specialty of the study of the female reproductive system

3. GynecologistA physician who specializes in the treatment of women

4. Gestation is the length of time from conception to birth, usually nine months; forty weeks.It is calculated from the first day of the last menstrual period, with a range from 259-280 days.A baby born before 37 weeks gestation is considered premature. GestationThe time required for the development of a fetus

5. Trimester Gestation is divided into three trimesters, or stages of development

6. Weeks 1-12Week 1-8 called an embryoWeeks 8-12 called a fetusAll major organs and body systems are formedFirst Trimester

7. Weeks 13-27Women start to look pregnant and may begin to wear maternity clothesEasiest stage of pregnancyMorning sickness usually subsidesSecond Trimester

8. Week 28-BirthFull term is 37-42 weeksBaby grows and organs matureFrequent fetal movementDiscomfort increases as delivery nearsThird Trimester