What is the third trimester during pregnancy?

The third trimester of pregnancy begins at week 28 and lasts until week 40. During this trimester, the fetus undergoes rapid growth and development. The following are some of the key changes that occur during the third trimester:

* Fetal growth: The fetus grows rapidly during the third trimester, gaining about 5 ounces per week. By the end of the third trimester, the fetus will weigh an average of 6 to 8 pounds.

* Fetal development: The fetus's organs and systems continue to develop during the third trimester. The lungs, kidneys, and liver are all fully functional by the end of the third trimester. The fetus also begins to produce vernix caseosa, a waxy substance that protects the skin.

* Maternal changes: The mother's body also undergoes a number of changes during the third trimester. The uterus continues to grow and expand, and the mother may experience back pain, swelling, and heartburn. The mother's breasts also begin to produce milk in preparation for breastfeeding.

* Signs of labor: As the third trimester progresses, the mother may begin to experience signs of labor. These signs include:

* Contractions: Contractions are regular, tightening sensations in the uterus.

* Bloody show: Bloody show is a small amount of blood-tinged mucus that is expelled from the vagina.

* Water breaking: Water breaking is the rupture of the amniotic sac, which releases the amniotic fluid.

The third trimester of pregnancy is a time of both excitement and anticipation. As the mother prepares for the birth of her child, she can also enjoy the feeling of her baby growing and moving inside of her.