Third Trimester: Understanding the Final Stages of Pregnancy (2023 Updated)

The third trimester of pregnancy is an exciting but sometimes challenging time for expectant mothers. As the due date approaches, mothers-to-be may feel a mix of anticipation, anxiety, and fatigue. Understanding the changes that occur in the body during this trimester can help prepare for the arrival of the baby and make the experience more manageable.
During the third trimester, which typically lasts from week 27 to week 40, the baby undergoes significant growth and development. The fetus will gain the most weight during this stage of pregnancy, going from around 2 pounds at the start of the trimester to an average of around 7 pounds at the end. The baby’s lungs and brain are continuing to mature, and the baby will be practicing breathing and other essential life skills.
The mother’s body is also undergoing significant changes during the third trimester. As the baby grows, the uterus expands to accommodate the increased size. This can cause discomfort, such as Braxton Hicks contractions, back pain, and difficulty sleeping. Additionally, the mother may experience swelling in the feet and ankles, and fatigue as the body prepares for the birth.
Preparing for the arrival of the baby is an important aspect of the third trimester. This can include creating a birth plan, attending prenatal classes, and stocking up on baby supplies. It’s also important to know when to pack a hospital bag and what to include. With so many things to think about and plan, it’s important to stay organized and find ways to reduce stress.
In summary, the third trimester of pregnancy is a time of significant growth and development for both the mother and the baby. There are lots of changes after the first trimester and second trimester of pregnancy.
Understanding the changes that occur in the body during third trimester can help expectant mothers prepare for the arrival of the baby and make the experience more manageable.

Physical Changes in the Third Trimester
The third trimester of pregnancy brings a number of physical changes for the expectant mother. As the due date approaches, the baby continues to grow and put pressure on the mother’s organs and muscles. This can cause a variety of symptoms and discomforts.
One of the most common symptoms during the third trimester is back pain. The growing uterus can put pressure on the lower back and hips, causing pain and discomfort. Additionally, as the baby moves lower into the pelvis in preparation for birth, it can put pressure on the sciatic nerve, causing pain to radiate down the legs.
Another common symptom during the third trimester is Braxton Hicks contractions. These are mild, irregular contractions that can occur throughout pregnancy, but become more frequent in the third trimester. These contractions help to prepare the uterus for labor and delivery, but can be uncomfortable for the mother.
Swelling in the feet and ankles is also common during the third trimester. This is caused by the accumulation of fluids in the body, and can be exacerbated by prolonged standing or sitting.
Fatigue is also a common symptom during the third trimester as the body works to support the growth and development of the baby. The mother may experience more tiredness and need more rest than usual.
While these symptoms can be uncomfortable, there are ways to manage them. Staying active and doing exercises that are appropriate for pregnancy can help to alleviate back pain and improve overall comfort. Staying well-hydrated, avoiding prolonged standing or sitting, and elevating the feet can help with swelling. Taking rest when needed and following a healthy diet can help with fatigue.
In summary, the third trimester of pregnancy brings a number of physical changes for the expectant mother, including back pain, Braxton Hicks contractions, swelling, and fatigue. While these symptoms can be uncomfortable, there are ways to manage them and stay comfortable throughout the pregnancy.

Fetal Development in the Third Trimester
The third trimester of pregnancy marks an important stage in the development of the baby. During this time, the baby will undergo significant growth and development, preparing for life outside the womb.
As the third trimester begins, the baby weighs around 2 pounds and measures around 14 inches in length. However, by the end of the trimester, the baby will have gained an average of around 5 pounds and will measure around 18-22 inches in length. The baby’s lungs and brain will continue to mature, and the baby will be practicing breathing and other essential life skills.
The baby’s movements will also become more vigorous during the third trimester. The baby will be more active, and the mother may be able to feel the baby kicking, punching, and hiccupping. This is a good sign that the baby is healthy and developing properly.
At around 36 weeks, the baby’s head will begin to engage in the pelvis, preparing for birth. This is known as “lightening,” and it means the baby is getting into position for delivery. The baby’s position in the uterus can be felt by the doctor or midwife during a pelvic exam.
The third trimester is also the time when the baby is considered full-term. This means that the baby is considered mature enough to be born and has a good chance of survival outside the womb. The due date, which was estimated at the beginning of pregnancy, will be refined to a more accurate due window during the third trimester.
In summary, the third trimester of pregnancy marks an important stage in the development of the baby, with significant growth and development taking place. The baby’s movements become more vigorous, the baby’s head will engage in the pelvis, and the baby will be considered full-term. This stage of pregnancy is crucial for the baby’s survival and preparing for birth.

Preparing for Birth in the Third Trimester
As the third trimester of pregnancy comes to a close, expectant mothers should focus on preparing for the birth of their baby. This includes creating a birth plan, attending prenatal classes, and stocking up on baby supplies. It is also important to know when to pack a hospital bag and what to include.
A birth plan is a document that outlines the mother’s preferences for labor and delivery. It can include things like preferred pain management techniques, who the mother wants to be present with during labor and delivery, and what kind of atmosphere the mother would like in the delivery room. Creating a birth plan is a great way for the mother to feel more in control of the birth process and to communicate her preferences to her healthcare provider.
Prenatal classes are another important aspect of preparing for birth. These classes can provide expectant mothers with important information about the birthing process, including what to expect during labor and delivery, pain management techniques, and postpartum care. It’s also an opportunity to meet other expecting parents, which can be helpful for emotional support.
Stocking up on baby supplies is also an important part of preparing for birth. This includes items such as diapers, wipes, baby clothes, and a car seat. It’s a good idea to have these items ready well before the due date, in case the baby comes early.
Finally, it’s important to know when to pack a hospital bag and what to include. A hospital bag should be packed around 36 weeks, and should include items such as comfortable clothing for the mother and father, toiletries, and any important documents.
In summary, preparing for birth in the third trimester is an important step in getting ready for the arrival of the baby. This includes creating a birth plan, attending prenatal classes, stocking up on baby supplies, and knowing when to pack a hospital bag and what to include. It’s important to stay organized and reduce stress during this time.
Conclusion: The Third Trimester and the Arrival of the Baby
The third trimester of pregnancy is an exciting yet challenging time for expectant mothers. It is a time of significant growth and development for both the mother and the baby. Understanding the changes that occur in the body during this trimester can help prepare for the arrival of the baby and make the experience more manageable.
In this article, we have discussed the physical changes that occur in the mother’s body during the third trimester, including back pain, Braxton Hicks contractions, swelling, and fatigue. We have also covered the fetal development that takes place during this time, including the baby’s growth, position, and maturity. Additionally, we have discussed the importance of preparing for birth, including creating a birth plan, attending prenatal classes, stocking up on baby supplies, and packing a hospital bag.
As the due date approaches, it’s important for expectant mothers to take care of themselves and prepare for the arrival of their baby. This includes staying active, eating a healthy diet, and getting enough rest. It’s also important to stay organized, reduce stress, and reach out for support when needed.
In conclusion, the third trimester of pregnancy is a time of great change and preparation. It’s an exciting time as the mother and baby prepares for the arrival of the baby. With the right knowledge and preparation, expectant mothers can navigate this stage of pregnancy with confidence and look forward to the arrival of their new bundle of joy.
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References
- American College of Obstetricians and Gynecologists. (2021). Third Trimester of Pregnancy. Retrieved from https://www.acog.org/patient-resources/faqs/pregnancy/third-trimester-of-pregnancy
- March of Dimes. (2021). Third Trimester of Pregnancy. Retrieved from https://www.marchofdimes.org/pregnancy/third-trimester-of-pregnancy.aspx
- Centers for Disease Control and Prevention. (2021). Third Trimester of Pregnancy. Retrieved from https://www.cdc.gov/pregnancy/third-trimester/index.html
- American Pregnancy Association. (2021). Third Trimester Pregnancy. Retrieved from https://americanpregnancy.org/pregnancy-week-by-week/third-trimester/
- Mayo Clinic. (2021). Third Trimester of Pregnancy. Retrieved from https://www.mayoclinic.org/healthy-lifestyle/pregnancy-week-by-week/in-depth/third-trimester/art-20044246
Frequently Asked Questions (FAQ) for Third Trimester
What happens during the third trimester of pregnancy?
During the third trimester of pregnancy, the baby undergoes significant growth and development, preparing for life outside the womb. The mother’s body is also undergoing significant changes, as the uterus expands to accommodate the increased size of the baby. This can cause discomfort, such as Braxton Hicks contractions, back pain, and difficulty sleeping. Additionally, the mother may experience swelling in the feet and ankles and fatigue as the body prepares for the birth.
What are the physical changes that occur in the third trimester of pregnancy?
The third trimester of pregnancy brings a number of physical changes for the expectant mother. As the due date approaches, the baby continues to grow and put pressure on the mother’s organs and muscles. This can cause a variety of symptoms and discomforts, such as back pain, Braxton Hicks contractions, swelling in the feet and ankles, and fatigue.
How does the baby develop during the third trimester?
The baby undergoes significant growth and development during the third trimester. The baby’s lungs and brain will continue to mature, and the baby will be practicing breathing and other essential life skills. At around 36 weeks, the baby’s head will begin to engage in the pelvis, preparing for birth. The third trimester is also the time when the baby is considered full-term, meaning the baby is mature enough to be born and has a good chance of survival outside the womb.
What should I do to prepare for birth in the third trimester?
Preparing for birth in the third trimester is an important step in getting ready for the arrival of the baby. This includes creating a birth plan, attending prenatal classes, stocking up on baby supplies, and knowing when to pack a hospital bag and what to include. It’s important to stay organized and reduce stress during this time.
How can I manage the physical discomforts of the third trimester?
There are ways to manage the physical discomforts of the third trimester. Staying active and doing exercises that are appropriate for pregnancy can help to alleviate back pain and improve overall comfort. Staying well-hydrated, avoiding prolonged standing or sitting, and elevating the feet can help with swelling. Taking rest when needed and following a healthy diet can help with fatigue.
How can I prepare for my baby’s arrival in the third trimester?
Preparing for the arrival of the baby is an important aspect of the third trimester. This can include creating a birth plan, attending prenatal classes, and stocking up on baby supplies. It’s also important to know when to pack a hospital bag and what to include. With so many things to think about and plan, it’s important to stay organized and find ways to reduce stress.
How can I reduce stress in the third trimester?
There are a number of ways to reduce stress in the third trimester. Staying organized, setting realistic expectations, and finding time to relax and do things you enjoy can all help. It’s also important to reach out for support when needed and talk to your partner, friends, and family about your feelings.
What should I pack in my hospital bag for the third trimester?
A hospital bag should be packed around 36 weeks, and should include items such as comfortable clothing for the mother and father, toiletries, any important documents, and any items you may need during your stay in the hospital. It’s also a good idea to pack a going-home outfit for the baby, as well as items such as diapers, wipes, baby clothes, and a car seat.
What are Braxton Hicks contractions?
Braxton Hicks contractions are mild, irregular contractions that can occur throughout pregnancy, but become more frequent in the third trimester. These contractions help to prepare the uterus for labor and delivery, but can be uncomfortable for the mother.
What is the difference between Braxton Hicks contractions and real labor contractions?
Braxton Hicks contractions are mild, irregular contractions that occur throughout pregnancy and are not a sign of labor. Real labor contractions are usually more intense and regular, and occur closer together as labor progresses. They also usually get stronger and longer over time, and eventually cause the cervix to open.
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