The average duration of a human pregnancy is 9 months or 40 weeks, calculated from the first day of the woman's last menstrual period (LMP).

The latent phase is the first stage of labor, characterized by mild and irregular contractions that gradually increase in intensity and frequency.

Progesterone is the hormone responsible for maintaining the pregnancy by preparing the uterus for implantation, supporting the growth of the placenta, and inhibiting uterine contractions.

The fertilized egg is called a zygote, which then develops into an embryo and later a fetus.

The umbilical cord is the organ that connects the fetus to the placenta, allowing for the exchange of nutrients, oxygen, and waste products.

Labor, delivery, and parturition are all terms used to describe the process of giving birth.

The amniotic sac is the fluid-filled sac that surrounds the fetus during pregnancy, providing a protective environment and allowing for movement.

The second trimester of pregnancy is characterized by rapid fetal growth and development, including the formation of major organs and systems.

Oxytocin is the hormone that triggers the onset of labor by stimulating contractions of the uterus.

The average weight of a newborn baby is 7-9 pounds.

Preterm labor is the term used to describe a pregnancy that lasts less than 37 weeks.

Postterm labor is the term used to describe a pregnancy that lasts more than 42 weeks.

Miscarriage is the term used to describe the loss of a pregnancy before 20 weeks.

Stillbirth is the term used to describe the death of a fetus or baby after 20 weeks of pregnancy.

The recommended amount of weight gain during pregnancy is 25-35 pounds.