Pregnancy is typically divided into 3 trimesters. The first trimester is from week 1 through 12. During the first trimester, the possibility of miscarriage is at its highest. The second trimester is from week 13 through 28. At 28 weeks, more than 90% of babies can survive outside of the uterus if provided with high-quality medical care. The third trimester is from 29 weeks through 40 weeks.
Prenatal care improves pregnancy outcomes. Prenatal care may include:
Complications of pregnancy may include:
In the ideal childbirth, labor begins on its own when a woman is "at term". Pregnancy is considered at full term when gestation has lasted 39 to 41 weeks.