When is the Third Trimester of Pregnancy?

Physical and Emotional Changes during the Third Trimester

The third trimester of pregnancy typically begins at week 28 and lasts until week 40 or until delivery. During this time, the body undergoes a number of physical changes as the baby continues to grow and prepare for birth. Some of the most common changes include:

Weight gain: As the baby grows, the mother’s weight will continue to increase. Most women gain an average of 1 pound per week during the third trimester.

Shortness of breath: As the uterus expands and puts pressure on the diaphragm, many women experience shortness of breath during the third trimester.

Back pain: The extra weight and pressure on the lower back can cause discomfort and pain in many women.

Braxton Hicks contractions: These “practice” contractions can start to become more frequent and intense during the third trimester as the body prepares for labor.

In addition to physical changes, many women also experience a range of emotional changes during the third trimester. Anxiety and stress about labor and delivery, as well as concerns about becoming a parent, are common. Many women also experience mood swings, increased fatigue, and difficulty sleeping. It’s important to practice self-care and seek support from loved ones during this time to help manage these emotional changes.

Fetal Development and Milestones in the Third Trimester

During the third trimester, the baby goes through a period of rapid growth and development as they prepare for life outside the womb. Some of the key fetal development milestones during this time include:

Size and weight: By the end of the third trimester, the average baby weighs between 6 and 9 pounds and measures around 18-21 inches in length.

Lung development: The baby’s lungs continue to mature and develop in preparation for breathing air outside the womb.

Brain development: The brain grows rapidly during the third trimester, and the baby’s nervous system becomes more advanced.

Fat development: The baby begins to accumulate more fat under their skin during the third trimester, which helps regulate their body temperature after birth.

Muscle development: The baby’s muscles continue to strengthen and develop, allowing them to move more easily and prepare for the physical demands of delivery.

It’s important to note that these milestones are general guidelines, and each baby develops at their own pace. Regular prenatal check-ups with a healthcare provider can help ensure that the baby is growing and developing properly.

Common Concerns and Complications in the Third Trimester

While many women have healthy pregnancies and deliveries, there are some common concerns and complications that can arise during the third trimester. Some of the most common issues include:

Gestational diabetes: This condition affects some women during pregnancy and can lead to high blood sugar levels that may harm both the mother and baby.

Pre-eclampsia: This condition involves high blood pressure and can be a serious complication that requires medical treatment.

Placenta previa: This occurs when the placenta covers the cervix, which can lead to bleeding and potentially require a cesarean delivery.

Preterm labor: This occurs when labor begins before 37 weeks of pregnancy and can lead to a range of complications for the baby.

Decreased fetal movement: If the baby is moving less than usual or not at all, it may be a sign of a problem and should be reported to a healthcare provider immediately.

It’s important for pregnant women to be aware of these potential complications and to seek medical attention if they experience any concerning symptoms. Regular prenatal care and communication with a healthcare provider can help identify and manage these issues as early as possible.

Self-care and Preparing for Labor during the Third Trimester

As the due date approaches, it’s important for pregnant women to focus on self-care and preparing for labor and delivery. Some self-care strategies for the third trimester include:

Getting enough rest: It’s important to prioritize sleep and rest as much as possible during the third trimester, as fatigue can be a common issue.

Eating a healthy diet: A well-balanced diet can help support both the mother’s and baby’s health during this time.

Staying active: Regular exercise can help manage stress, boost energy levels, and prepare the body for labor and delivery.

Attending childbirth classes: Many hospitals and birthing centers offer classes that can help prepare parents for labor and delivery, including pain management techniques and relaxation exercises.

In addition to self-care, it’s also important to make preparations for labor and delivery. This can include packing a hospital bag, creating a birth plan, and discussing pain management options with a healthcare provider. Taking steps to prepare for the physical and emotional demands of labor and delivery can help reduce anxiety and increase confidence during this time.


The third trimester of pregnancy is an important and exciting time as the baby prepares for birth. While it can also bring physical and emotional challenges, regular prenatal care and self-care strategies can help manage these issues and prepare for labor and delivery. By staying informed and working closely with a healthcare provider, pregnant women can help ensure the best possible outcomes for both themselves and their babies.

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