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Third Trimester Of Pregnancy: Symptoms & Baby’s Development

Third Trimester Of Pregnancy

As expectant mothers journey through the miraculous process of pregnancy, the third trimester marks a significant milestone. It's a period filled with anticipation, excitement, and perhaps a touch of nervousness as the due date draws near. During this final stretch of pregnancy, both mother and baby undergo remarkable changes, preparing for the momentous arrival.

In the third trimester, the baby continues to grow and develop rapidly, reaching a size where movements become more pronounced and recognizable. Meanwhile, the mother may experience a range of physical sensations, from increased discomfort due to the expanding belly to nesting instincts as she prepares for the baby's arrival.

Amidst the joys and challenges of the third trimester, self-care becomes essential for both the mother and baby. That's where Pink Orchid offers a nurturing touch with specialized pregnancy massages and baby massages in the comfort of your own home in Pune. 

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Third Trimester Pregnancy Symptoms

As expectant mothers progress through their pregnancy journey, the third trimester brings about significant changes and unique experiences. Here, we explore six key symptoms that commonly arise during this final stage of pregnancy, offering insight and guidance for mothers-to-be as they navigate this transformative time.

1. Increased Size And Weight Gain

One of the most noticeable symptoms of the third trimester is the rapid growth of the baby and the expansion of the uterus. As the baby continues to develop, expectant mothers will experience a significant increase in their belly size and overall weight gain. This growth is essential for the baby's development but can lead to physical discomfort and changes in posture.

2. Frequent Urination

Pressure from the growing uterus can put additional strain on the bladder during the third trimester, leading to more frequent trips to the bathroom. As the baby descends into the pelvis in preparation for birth, the pressure on the bladder intensifies, causing even more frequent urination. While inconvenient, this symptom is entirely normal during the final weeks of pregnancy.

3. Backaches And Pelvic Pain

As the body prepares for childbirth, many expectant mothers experience backaches and pelvic pain during the third trimester. The additional weight of the baby, coupled with hormonal changes and shifts in posture, can put strain on the spine and pelvis, leading to discomfort. Practicing good posture, gentle stretching exercises, and using supportive pillows can help alleviate some of the discomfort associated with backaches and pelvic pain.

4. Heartburn And Indigestion

Hormonal changes during pregnancy can relax the muscles of the digestive tract, leading to heartburn and indigestion, particularly in the third trimester. The growing uterus also puts pressure on the stomach, exacerbating these symptoms. Eating smaller, more frequent meals, avoiding spicy or greasy foods, and sitting upright after eating can help alleviate heartburn and indigestion.

5. Swelling

Swelling, or edema, is a common symptom experienced by many pregnant women during the third trimester. Increased fluid retention and changes in blood flow can cause swelling in the feet, ankles, and hands. While mild swelling is normal, sudden or severe swelling could be a sign of preeclampsia, a serious pregnancy complication. It's essential to monitor swelling closely and report any concerns to your healthcare provider.

6. Fatigue

Growing a baby is hard work, and it's entirely normal to feel more tired than usual during the third trimester. As the body works overtime to support the baby's development, expectant mothers may experience increased fatigue and a need for more rest. Practicing good sleep hygiene, taking short naps during the day, and listening to your body's cues can help manage fatigue during this stage of pregnancy.

Third Trimester Of Pregnancy

When Does The Third Trimester Of Pregnancy Start? Weeks & Months

In pregnancy, the journey is typically divided into three trimesters, each lasting around three months. Reaching week 27 marks the entrance into the final trimester, a period filled with anticipation as the baby's arrival draws nearer. While conventionally ending around week 40, the third trimester's duration varies as it concludes with the birth of the baby. 

This flexibility acknowledges that pregnancies don't always adhere to precise timelines, emphasizing the importance of readiness for labor whenever it may occur. Expectant parents should embrace the unpredictability, staying informed and prepared for the joyous moment when they finally meet their newborn.

Fetal Growth And Development In The Third Trimester Of Pregnancy

During the third trimester of pregnancy, the baby experiences rapid growth and development, reaching significant milestones as they prepare for life outside the womb. Let's explore the week-by-week progress of the baby's growth during this remarkable period:

Week 28

At this stage, the baby weighs around 2.2 pounds (1 kg) and measures about 14.8 inches (37.6 cm) from head to heel. The lungs continue to mature, and the baby's eyes can open and close. They are becoming more active, with noticeable kicks and movements felt by the mother.

Week 29

By week 29, the baby's growth continues, with the lungs developing further and the brain undergoing rapid growth. The baby's senses are becoming more refined, with the ability to taste and respond to stimuli such as light and sound. At this stage, the baby may have periods of activity and rest, indicating the establishment of sleep patterns.

Week 30

At around 3 pounds (1.4 kg) and 15.7 inches (39.9 cm) in length, the baby's growth is in full swing. They are gaining fat stores, which help regulate body temperature after birth. The baby's movements may become more pronounced as they have less space to move around in the womb.

Week 31

By week 31, the baby's growth continues as they approach their birth weight and length. The brain is rapidly developing, with the formation of billions of neurons and intricate neural connections. The baby's immune system is also maturing, preparing them for life outside the protective environment of the womb.

Week 32

At this stage, the baby weighs around 3.75 pounds (1.7 kg) and measures approximately 16.7 inches (42.4 cm) in length. Their bones are hardening, although the skull remains soft and flexible to ease passage through the birth canal. The baby's kicks and movements may be strong enough to be visible from the outside.

Week 33

The baby's growth continues, with their weight increasing to about 4.2 pounds (1.9 kg). They are gaining layers of fat, giving their skin a smoother appearance. The baby's lungs are nearly fully developed, and they may practice breathing movements by inhaling and exhaling amniotic fluid.

Week 34

By week 34, the baby's growth is nearing completion, with its weight around 4.7 pounds (2.1 kg) and length approximately 17.7 inches (45 cm). The baby's internal organs are functioning well, and they are fine-tuning their coordination and reflexes. At this stage, the baby may settle into a head-down position in preparation for birth.

Week 35-40

In the final weeks of the third trimester, the baby's growth continues at a steady pace, with minor variations in weight and length. By week 40, the baby is considered full-term and ready for birth, with an average weight of around 7.5 pounds (3.4 kg) and a length of approximately 19-21 inches (48-53 cm).

Nutritional Recommendations For The Third Trimester Of Pregnancy

As you journey through the final trimester of your pregnancy, nourishing your body with the right foods becomes even more crucial for both your health and your baby's development. Here's what to consider adding to your plate during this stage:

  1. Protein Powerhouses: Incorporate lean protein sources such as poultry, fish, tofu, beans, and lentils to support your baby's growth and keep you feeling full and energized.

  2. Healthy Fats: Opt for foods rich in omega-3 fatty acids like salmon, chia seeds, and walnuts to aid in your baby's brain and eye development.

  3. Calcium-Rich Foods: Ensure you're getting enough calcium by including dairy products, fortified plant-based milk, leafy greens, and calcium-fortified foods in your diet to support your baby's bone development.

  4. Iron-Rich Choices: Your body's demand for iron increases during pregnancy. Incorporate iron-rich foods such as lean red meat, poultry, beans, fortified cereals, and leafy greens to prevent iron deficiency anemia.

  5. Fiber-Filled Options: Constipation can be a common issue during pregnancy. Boost your fiber intake with fruits, vegetables, whole grains, and legumes to keep your digestion regular.

  6. Hydration Is Key: Stay adequately hydrated by consuming ample water throughout the day. Aim for at least eight glasses daily to support your body's increased fluid needs and prevent dehydration.

  7. Small, Frequent Meals: Choose smaller and more frequent meals and snacks to mitigate typical pregnancy discomforts such as heartburn and indigestion, while also maintaining stable energy levels. 

  8. Healthy Snacking: Choose nutrient-dense snacks like Greek yogurt with fruit, whole grain crackers with nut butter, or vegetable sticks with hummus to satisfy cravings and provide essential nutrients.

  9. Limit Processed Foods: Minimize intake of processed and high-sugar foods, opting instead for whole, unprocessed options to provide your body and baby with the best possible nutrition.

  10. Consult Your Healthcare Provider: Always consult with your healthcare provider or a registered dietitian for personalized guidance on your dietary needs during pregnancy, especially if you have specific dietary restrictions or concerns.

Abdominal Discomfort In The Third Trimester Of Pregnancy

Experiencing upper stomach pain during the third trimester can be concerning for expectant mothers. Here, we delve into the various factors that may contribute to this discomfort and provide detailed insights into each:

1. Indigestion And Heartburn

  • Hormonal changes during pregnancy, particularly the increase in progesterone levels, can relax the muscles of the digestive tract, leading to indigestion and heartburn. 

  • As the uterus expands, it can also exert pressure on the stomach, exacerbating these symptoms.

  • To manage indigestion and heartburn, consider eating smaller, more frequent meals, avoiding spicy or acidic foods, and remaining upright for some time after eating to allow gravity to aid digestion.

2. Gastric Reflux

  • As your baby continues to grow, the pressure on your stomach can cause gastric reflux, a condition characterized by the backward flow of stomach acid into the esophagus.

  • This can result in a burning sensation in the upper abdomen and chest, commonly known as heartburn. 

  • To alleviate discomfort, try eating slowly, avoiding large meals, and sleeping with your upper body elevated to prevent acid reflux.

3. Gallbladder Issues

  • Pregnancy hormones can slow down the emptying of the gallbladder, increasing the risk of gallstones or inflammation of the gallbladder (cholecystitis).

  • Upper abdominal pain, particularly on the right side, accompanied by nausea, vomiting, and fever, may indicate gallbladder problems. 

  • If you experience these symptoms, it's crucial to seek immediate medical attention to prevent complications.

4. Pre-Eclampsia

  • Pre-eclampsia is a serious condition characterized by high blood pressure and signs of damage to other organs, such as the liver and kidneys.

  • Upper abdominal pain, often accompanied by other symptoms like severe headaches, vision changes, swelling, and protein in the urine, may indicate pre-eclampsia.

  • This condition requires urgent medical intervention to prevent complications for both the mother and the baby.

5. Braxton Hicks Contractions

  • Braxton Hicks contractions are sporadic uterine contractions that occur throughout pregnancy, often becoming more noticeable in the third trimester. 

  • While these contractions are typically painless and irregular, they can sometimes cause discomfort in the upper abdomen, leading to confusion with true labor contractions.

  • Staying hydrated, changing positions, and resting can help alleviate Braxton Hicks contractions.

Back Pain During Pregnancy 3rd Trimester

Back pain is a common discomfort experienced by many expectant mothers, particularly during the third trimester. Here, we explore the causes of back pain during this stage of pregnancy and provide detailed strategies for managing and alleviating this discomfort:

1. Increased Weight Gain

During the third trimester, your baby experiences rapid growth, leading to a significant increase in weight. As your uterus expands to accommodate your growing baby, it puts additional strain on your back muscles and ligaments. This added weight, coupled with changes in your center of gravity, can contribute to back pain, particularly in the lower back and pelvic region.

2. Postural Changes

Pregnancy hormones like relaxin and progesterone play a crucial role in preparing your body for childbirth by loosening the ligaments in your pelvic area. While this hormonal shift is essential for labor and delivery, it can also lead to changes in your posture. As your belly grows larger and shifts forward, your spine may curve more than usual, causing strain on your back muscles and contributing to discomfort.

3. Stress On The Spine

As your uterus expands during the third trimester, it may press against the nerves and blood vessels in your back, leading to nerve compression and decreased blood flow. This can result in sharp or shooting pains in the lower back and buttocks, commonly known as sciatica. Additionally, the added weight of your growing baby can place pressure on your spinal discs, leading to discomfort and pain.

4. Poor Ergonomics

Engaging in activities that involve poor posture or repetitive movements can exacerbate back pain during pregnancy. Sitting or standing for prolonged periods, lifting heavy objects incorrectly, or wearing unsupportive footwear can all contribute to discomfort. Ensuring proper ergonomics, such as maintaining good posture, using supportive pillows while sleeping, and wearing supportive shoes, can help alleviate back pain and prevent further strain on your spine.

5. Relief Strategies

To manage back pain in the third trimester, practice good posture, use supportive pillows while sleeping, and engage in prenatal yoga or approved exercises to strengthen back muscles and improve flexibility. Applying heat or cold packs, receiving prenatal massages, and practicing relaxation techniques like deep breathing can also alleviate discomfort.

Sleeping Positions In The Second Trimester

As your pregnancy progresses into the second trimester, you may find it increasingly challenging to get a good night's sleep. Here's a detailed guide on navigating sleeping positions during this stage:

1. Left Side Position

  • Sleeping on your left side is often recommended during the second trimester as it improves circulation to the heart and allows for optimal blood flow to the fetus. 

  • This position also helps prevent the uterus from pressing on the liver, ensuring proper digestion.

2. Pillow Support

  • Utilizing pillows for support can greatly improve comfort during sleep. Position a pillow between your knees to relieve pressure on your hips and lower back.

  • You can also place a small pillow or rolled-up towel under your abdomen for extra support.

3. Avoiding Supine Position

  • While it's generally safe to sleep on your back during the early second trimester, as your uterus grows larger, lying flat on your back can compress major blood vessels, leading to decreased blood flow to the uterus and potentially causing dizziness, shortness of breath, or even fainting. 

  • Therefore, it's advisable to avoid the supine position and opt for side sleeping instead.

4. Elevating Upper Body

  • If you're experiencing heartburn or acid reflux during pregnancy, elevating your upper body slightly with additional pillows can help reduce discomfort. 

  • This elevation aids in preventing stomach acid from refluxing into the esophagus during sleep.

5. Experimenting With Positions

  • Every expectant mother is unique, and what may be effective for one may not be for another. Feel free to experiment with different sleeping positions and combinations of pillows to find what feels most comfortable for you. 

  • Don't hesitate to listen to your body and adjust as needed throughout the night.

Danger Signs Of Pregnancy In the Third Trimester

As you near the end of your pregnancy journey, it's crucial to remain vigilant for any signs or symptoms that may indicate potential complications. Here's a comprehensive guide to recognizing danger signs during the third trimester:

1. Vaginal Bleeding

While some light spotting can be normal, heavy bleeding or bright red blood could indicate more serious issues such as placental abruption, which requires immediate medical attention. Additionally, if you experience bleeding accompanied by abdominal pain or contractions, seek medical help promptly.

2. Severe Abdominal Pain

Intense or persistent abdominal pain, especially if it's localized to one area, could be a sign of various conditions such as preterm labor, placental abruption, or an ectopic pregnancy. It's essential to contact your healthcare provider immediately if you experience severe abdominal pain.

3. Sudden Swelling

While mild swelling, particularly in the ankles and feet, is common during pregnancy, sudden or severe swelling, especially if it's accompanied by other symptoms such as headaches, visual disturbances, or upper abdominal pain, may indicate a condition called pre-eclampsia. Pre-eclampsia requires immediate medical attention to prevent complications for both the mother and the baby.

4. Decreased Fetal Movement

As your pregnancy progresses, you should continue to monitor your baby's movements regularly. A sudden decrease in fetal movement or a significant change in your baby's typical activity pattern could signal fetal distress and necessitate immediate evaluation by your healthcare provider.

5. Leaking Fluid

If you experience a gush or trickle of fluid from your vagina, it could indicate your water breaking, signaling the onset of labor. However, it's essential to distinguish between amniotic fluid and other vaginal discharges. Amniotic fluid is typically clear and odorless, while urine or vaginal discharge may have a different appearance or smell. If you suspect your water has broken, contact your healthcare provider for guidance.

Must-Know Tips To Stay Healthy In The Third Trimester

As you approach the final stretch of your pregnancy journey, prioritizing your health becomes more crucial than ever. Here are six must-know tips to help you stay healthy and comfortable during the third trimester:

  1. Balanced Diet: Prioritize a diet rich in fruits, veggies, lean proteins, whole grains, and healthy fats to fuel both you and your baby.

  2. Stay Hydrated: Drink plenty of water to support circulation and prevent discomfort like headaches and constipation.

  3. Rest And Sleep: Aim for seven to nine hours of quality sleep each night and listen to your body's need for rest during the day.

  4. Stay Active: Engage in low-impact exercises like walking, swimming, or prenatal yoga to maintain muscle tone and prepare for labor.

  5. Manage Stress: Practice stress-reduction techniques such as deep breathing and seek support from loved ones or professionals if needed.

  6. Attend Prenatal Check-ups: Regular appointments with your healthcare provider are crucial for monitoring your health and the baby's development, addressing concerns, and preparing for childbirth.

When To See A Doctor?

During the third trimester of pregnancy, it's crucial to maintain regular prenatal check-ups and promptly seek medical attention if any concerning symptoms arise. While some discomforts are common as the body prepares for childbirth, certain signs may indicate a need for immediate medical evaluation. It's essential for expectant mothers to stay vigilant and communicate any changes or concerns with their healthcare provider.

One key indicator for seeking medical attention during the third trimester is a decrease in fetal movement. While it's normal for fetal movements to change in frequency and intensity as the pregnancy progresses, a significant decrease in movement or a sudden cessation should never be ignored. This could indicate potential fetal distress and requires immediate assessment by a doctor to ensure the well-being of the baby.

Additionally, persistent or severe symptoms such as vaginal bleeding, severe abdominal pain, sudden swelling of the hands or face, or signs of preterm labor such as regular contractions before 37 weeks gestation warrant prompt medical attention. 

These symptoms could indicate complications such as placental abruption, preeclampsia, or preterm labor, which require urgent evaluation and management to safeguard both maternal and fetal health. Overall, maintaining open communication with a healthcare provider and seeking timely medical care for any concerning symptoms is paramount to ensuring a safe and healthy pregnancy journey during the third trimester.


1. What Is The Third Trimester?

The third trimester is the final stage of pregnancy, spanning from week 28 until childbirth, typically around week 40.

2. Which Trimester Is The Hardest?

The first trimester is often considered the hardest due to symptoms like morning sickness, fatigue, and hormonal changes.

3. What Week Is The Baby's Gender Developed?

Baby gender typically develops around weeks 16 to 20 of pregnancy.


Third Trimester Of Pregnancy

As the journey through the third trimester of pregnancy comes to a close, it marks the culmination of months filled with anticipation, wonder, and perhaps a few challenges along the way. With each passing week, expectant mothers have experienced the remarkable growth and development of their little ones, eagerly preparing for the momentous arrival.

As we reflect on this final stretch of pregnancy, it's essential to acknowledge the physical and emotional changes that have occurred. From the discomforts of a growing belly to the joys of feeling those precious kicks and movements, the third trimester has been a time of immense transformation and anticipation.



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