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Third Trimester Of Pregnancy

Alternate Names

  • late prenatal period

Definition

Pregnancy is the term given to the series of events for a childbearing woman from the time of conception until the birth of the child.

What is the information for this topic?

During the third trimester, continuing growth and development in mother and baby cause many changes to occur. Women may notice: that the movements of the unborn child can be felt more stronglyabdominal pain that may or may not represent the start of labor shortness of breath because the uterus is pushing against the diaphragm. The diaphragm is a flat, strong muscle that aids in breathing. Towards the end of the third trimester, the baby may drop down into a lower position. This will make it easier for the mother to breathe.a need to urinate more often when the baby drops down into a lower position in the pelvisa yellow, watery fluid, known as colostrum, leaking from her nipplesher navel sticking out

As the body readies for birth, a woman's cervix begins to thin out and open. During the third trimester, certain discomforts and mood changes may occur: fatigue or extra energy, or alternate periods of bothincreasingly heavy white vaginal dischargemore mild lower abdominal pains with uterine tightening and then relaxingmore or less of an appetiteconstipation, heartburn and indigestion due to gastroesophageal reflux, gas, and bloatingheadaches, dizziness, or faintness more trouble sleepingitchy abdomenvaricose veins swelling of the legs, feet, and handsincreasing clumsiness as shape and balance changesanxiety, impatience, and restlessnessirritability and unusual sensitivity

In the unborn child: as the baby gets bigger, it has less room to kick and stretch, so the movements felt by the mother may decrease somewhatfine body hair disappearsmost bones harden, but bones of the head stay soft and flexible for birthas the time for birth approaches, the baby usually moves down into the pelvis and settles into a good position

At 40 weeks, the baby is considered full term. It is about 20 inches long and weighs 6 to 9 pounds. The most common health risks and concerns in the third trimester of pregnancy are: premature labor beginning before the 37th week of pregnancy. If the labor cannot be stopped, the baby may be born too early. This can cause many problems with the baby's health and development.vaginal bleeding changes in the unborn child's movementsrupture of the sac, or membranes, that surround the fetusfalse labor

During the third trimester of pregnancy, monitoring is more frequent. In the seventh and eighth months, it may include: mother's weight and blood pressureurine test for sugar and proteinthe baby's heartbeatheight of the uterussize and position of the baby

Any worrisome symptoms or concerns should be reported to the healthcare professional.

After the 32nd week, the healthcare professional may suggest monitoring every two weeks. Monitoring occurs weekly after about the 36th week, as the ninth month begins. It may include all of the above as well as examination of the cervix and discussion about the signs and symptoms of labor.

Sources

Planning for Pregnancy, Birth and Beyond. Second Edition, The American College of Obstetricians and Gynecologists.

What to Expect when You're Expecting, Eisenberg