Definition that contains time period
- first trimester time period extending from the first day of the last menstrual period through 12 weeks of gestation
- puerperium time period following childbirth when the mother's uterus shrinks and the other functional and anatomic changes of pregnancy are resolved
- second trimester time period extending from the 13th to the 27th week of gestation
- third trimester time period extending from the 28th week of gestation until delivery