Third trimester of pregnancy: What Should You Expect?

Becoming a mother is one of the most beautiful transformations in life. It’s a journey full of love, hope, excitement, and a deep sense of connection—and at the same time, a period where many women feel vulnerable, emotional, and full of questions. As you enter the third trimester of pregnancy, these feelings often become even stronger. Your baby is growing quickly, your body is preparing for birth, and your mind is imagining what your first moments together will feel like.

This article will guide you through the third trimester with warmth, clarity, and reassurance. You’ll learn what changes to expect, how your baby develops week by week, which symptoms are normal, and when it’s important to seek support. Think of it as a gentle companion during these final weeks—helping you feel informed, safe, and hopeful about the new life you’re about to welcome.

By this stage, your baby’s body is rich with powerful stem cells—especially in the umbilical cord blood and cord tissue. These stem cells play a key role in your baby’s growth and development, helping form healthy blood, immune cells, and tissues. Because they can only be collected once, at birth, many families begin exploring cord blood banking options during the third trimester. You don’t need to feel rushed—this is simply an ideal time to learn, ask questions, and make an informed decision before labor begins.

Third trimester of pregnancy: What Do You Need to Know?

The third trimester is the final chapter of pregnancy, beginning around week 28 and lasting until birth. It’s a time when your baby grows the fastest and your body makes remarkable adjustments to support this growth. Many women describe it as a meaningful mix of anticipation and preparation—a period where every kick feels a little stronger, every appointment feels more important, and your emotional connection to your unborn baby deepens.

During these weeks, you might notice physical changes like more pressure, swelling, or fatigue. Emotionally, you may oscillate between joy, curiosity, and moments of worry. All of these experiences are normal, and understanding them helps replace fear with confidence. This section sets the foundation for everything that follows—your symptoms, your baby’s development, and the steps your body takes to prepare for childbirth.

As you approach birth, you naturally begin planning for your baby’s safety and future. This is also when many healthcare providers introduce the topic of stem cell preservation, because the decision must be made before delivery. The third trimester gives you enough time to explore whether storing your baby’s stem cells aligns with your family’s wishes, values, and long-term plans.

Is the third trimester of pregnancy week 27 or 28?

Many expecting mothers wonder whether the third trimester of pregnancy begins in week 27 or 28.
 Different medical systems or regions use slightly different definitions, which can create confusion. However, most healthcare providers agree that week 28 marks the official beginning of the third trimester.

This small difference doesn’t change your care or the timeline significantly. What matters is recognizing that by this stage, your baby is entering a period of rapid growth, and your body is preparing in powerful and beautiful ways for labor and delivery.

What happens in the final stage of pregnancy?

The final stage of pregnancy is a period of tremendous change—both visible and invisible. Your body carries more weight, your energy levels may shift, and your emotions may feel deeper or more complex. At the same time, your baby is completing essential developmental milestones, making them ready to thrive outside your womb.

Many mothers describe these weeks as both challenging and magical. You may feel slower physically, but emotionally, your connection to your baby grows stronger than ever. Nesting instincts, increased doctor visits, and new bodily sensations all play a part in preparing you for birth.

What should you expect during these final weeks?

In the last weeks of pregnancy, prenatal appointments become more frequent, helping your care provider monitor your baby’s position, growth, and movements. You may also notice more intense or frequent symptoms like swelling, tightening sensations, or back pain. Some women feel a strong need to prepare their home—washing tiny clothes, organizing baby items, or cleaning everything in sight.

Emotionally, you may shift between excitement and nervousness as you get closer to birth. It’s perfectly normal to feel many things at once. Your body is doing something extraordinary, and every symptom reminds you that your baby is nearing their arrival.

What happens to your body during this time?

During the third trimester, your body undergoes significant physical adjustments to support your growing baby. The uterus expands upward and outward, pushing against the diaphragm, stomach, and other organs. This can create sensations like pelvic pressure, shortness of breath, or difficulty finding comfortable positions.

Swelling in the feet, ankles, or hands is common due to increased fluid retention. Back pain may intensify as posture changes and your center of gravity shifts. Though these changes can feel overwhelming, they reflect the incredible strength and adaptability of your body during this final stretch.

What’s happening internally during late pregnancy?

Internally, your body is working in ways you may not fully feel or see, but these processes are essential for a smooth birth experience. Hormones like relaxin gently soften your ligaments and joints, allowing the pelvis to widen in preparation for labor. Your blood volume rises significantly, improving circulation to both you and your baby.

Your metabolism remains elevated, helping your baby gain weight and complete key developmental stages. These internal adjustments show just how intelligently your body prepares for the moment you’ll meet your newborn.

As your baby’s organs finish maturing, stem cells continue playing a key part in building and strengthening their blood, immune, and nervous systems. These cells will be abundant in the umbilical cord at birth—one reason many parents choose to preserve them. Knowing this can help you appreciate just how active and precious this late-pregnancy development truly is.

How does your baby develop during the third trimester of pregnancy?

Your baby’s development during the final trimester is extraordinary. Each week brings new milestones and refinements that prepare them for life outside the womb. Their organs mature, their senses become more active, and their movements often become stronger and more coordinated.

This trimester is when your baby transforms from a small, curled embryo-like figure into a fully formed newborn with soft skin, plump limbs, and a uniquely recognizable profile. Understanding their growth can help you feel more connected and reassured during these final weeks.

What happens to the baby’s body at this stage?

During this stage, your baby experiences rapid physical growth and refinement. Their once-thin skin begins to thicken as fat accumulates, giving them that soft newborn roundness. Fingernails and toenails form, fine hair appears on the head, and their facial features become more defined.

Inside, the brain forms millions of new neural connections, strengthening learning, movement, and responsiveness to the world. The digestive system continues maturing, preparing your baby for feeding after birth. Every week brings them closer to being ready to meet you.

Because your baby is now producing and circulating millions of healthy new blood and immune cells, their cord blood contains a rich supply of stem cells at birth. These cells are used in modern medicine to treat certain blood disorders and immune conditions. Parents who choose to store cord blood often say they felt more confident after understanding how active this stage of development is.

What does your baby look like by the end of pregnancy?

By the end of pregnancy, most babies look remarkably similar to how they will appear after birth—only a bit smaller and curled up from their snug environment. Their skin becomes less transparent and more opaque, taking on a smooth, soft appearance. Cheeks become fuller, limbs round out, and their body begins storing fat to help regulate temperature after delivery.

Many babies also have eyebrows, eyelashes, and wisps of hair. Their overall look becomes more familiar and “newborn-like,” making ultrasound photos especially emotional for expecting parents.

What changes occur around week 28?

By week 28:

• Baby’s vision improves—they can sense light.
• The lungs continue developing.
• Movements become stronger and more rhythmic.
• Some babies begin moving into a head-down position.

What developments happen in week 29?

• Bones strengthen.
• Muscle tone improves.
• Brain activity shows early sleep cycles, including REM patterns.

What growth occurs in week 30?

• Baby begins regulating temperature better.
• Growth spurts are common.
• Movements may feel more coordinated.

What’s happening in week 31?

• Lungs grow more elastic.
• Baby responds more to sound.
• Movements tighten as the womb becomes cozier.

How does your baby progress in week 32?

• Most organs are nearly fully mature.
• Baby often settles into a birthing position.
• Weight gain increases noticeably.

What changes can you expect physically and emotionally in third trimester of pregnancy?

Every mother experiences these weeks differently, but many patterns are common—and normal. Understanding them helps you feel more prepared and less worried.

What are typical maternal changes and symptoms?

• Heaviness in the abdomen
• Back pain
• Swelling in feet or hands
• Digestive discomfort
• Shortness of breath
• Frequent urination

What are Braxton Hicks contractions?

Braxton Hicks contractions are often described as “practice contractions.” They feel like a tightening or squeezing sensation across the entire belly and typically come and go without forming a regular pattern. Unlike real labor contractions, they usually ease with rest, hydration, or changing position.

These contractions help your uterus strengthen and prepare for birth. While they can be surprising or uncomfortable, they are a normal and healthy part of late pregnancy.

What emotional changes are common?

Emotionally, you may experience mood swings, anxiety, excitement, or moments of deep tenderness. Many mothers describe feeling especially connected to their baby during this stage, imagining what they will look like or what their first cry will sound like.

It’s also normal to feel worried about labor, parenting, or the big life transition ahead. Hormones, physical discomfort, and lack of sleep can intensify emotions. Treat yourself with compassion—these feelings reflect your love and your readiness to protect your growing family.

What symptoms appear around week 28?

Around week 28, symptoms like stronger kicks, tightening sensations, reflux, leg cramps, or breast changes may appear. Sleep may become less restful as your belly grows and your mind stays active.

These changes are all signs that your body is supporting rapid growth and gearing up for the months ahead.

What symptoms appear around week 30?

In week 30, many women notice increasing fatigue, reduced mobility, and intensifying swelling or varicose veins. Your body is carrying more weight than ever, and rest becomes even more important.

Listening to your body’s signals and slowing down when needed helps you stay balanced and supported.

What causes stretch marks at this stage?

Stretch marks appear when the skin stretches quickly to accommodate your growing belly, breasts, or thighs. Hormonal changes affect collagen fibers, making the skin slightly more prone to these marks.

Over time, stretch marks usually fade in color and become much less noticeable. They are a natural and common part of pregnancy—a sign of the incredible transformation your body is undergoing.

Why do heartburn and indigestion increase?

Heartburn becomes more common in the third trimester because digestion slows down and the uterus presses upward on the stomach. This makes stomach acids more likely to rise, creating a burning or uncomfortable sensation.

Certain foods and large meals can trigger symptoms, and lying down immediately after eating may worsen them. While uncomfortable, this is normal and often improves with small lifestyle adjustments.

From “Why do nosebleeds occur?” to “How do practice contractions fit into labor signs?” in third week of pregnancy

Why do nosebleeds occur?

Nosebleeds are more common in pregnancy because the tiny blood vessels inside the nose become more sensitive due to hormonal changes and increased blood volume. Dry air or warm climates can make them more frequent.

Though they may feel alarming, they are usually harmless and can often be managed with hydration, humidifiers, or gentle moisturization.

What causes shortness of breath in third week pregnancy?

Shortness of breath occurs when your uterus pushes against your diaphragm, making it slightly harder for your lungs to fully expand. Hormonal changes can also increase your awareness of breathing.

This sensation tends to ease once your baby “drops” into the pelvis in preparation for birth.

Why is urination more frequent?

Frequent urination happens because your bladder has less room as your baby grows. Your kidneys are also processing more fluid than usual.

While it can feel inconvenient, it’s a completely normal part of pregnancy and improves after delivery.

What causes swelling?

Swelling results from fluid retention and the increased pressure your uterus places on your veins. It’s usually more noticeable in warm weather or after standing for long periods.

Elevating your legs, staying well-hydrated, and wearing comfortable shoes can help ease discomfort.

Why does back pain increase in third week of pregnancy?

As your belly grows, your posture shifts and your lower back takes on more strain. Relaxin also loosens the joints, which can reduce stability.

Your baby’s position can add extra pressure on nerves or muscles, making back pain more noticeable.

What contributes to difficulty sleeping?

Sleep becomes harder due to discomfort, frequent urination, hormonal fluctuations, and mental restlessness. Many women struggle to find a comfortable position as their belly grows.

Using support pillows and lying on your side can help you rest more comfortably.

Why might colostrum leak?

Colostrum leaks because your breasts are preparing early for feeding. This thick, golden fluid is incredibly nutritious and can appear anytime during the third trimester.

It varies from person to person—some women notice it early, while others don’t see it until closer to birth.

What not to do at this stage?

Avoid activities that carry unnecessary risks, such as heavy lifting, high-impact sports, unapproved medications, or raw foods. Your baby is more sensitive during these final weeks, making safety especially important.

This is a time to slow down, take care of yourself, and prioritize gentle, supportive routines.

What actions should be limited?

Standing for too long, exposure to excessive heat, and high-stress environments should be minimized. Your body works harder now, and reducing strain helps keep you and your baby safe.

Listening to your body is key—rest is a form of love for both you and your growing child.

When should you contact your midwife or hospital right away in third trimester of pregnancy?

If you notice decreased fetal movements, strong contractions, unusual discharge, bleeding, or your water breaking, contact your care provider immediately. Your instincts matter—if something feels wrong, it’s always better to call.

Healthcare teams are there to support you, reassure you, and ensure both you and your baby are safe.

What should you expect at prenatal appointments?

Prenatal visits typically include monitoring your blood pressure, measuring fundal height, listening to your baby’s heartbeat, and discussing your birth plan. Appointments become more frequent as you approach your due date.

These visits offer valuable opportunities to ask questions and feel fully supported.

During these frequent prenatal visits, many parents decide whether they want to preserve their baby’s cord blood and tissue. Because collection happens immediately after birth, hospitals usually require arrangements to be made in advance. If this is something you’re considering, the third trimester is the perfect time to finalize your choice with clarity and confidence.

Why is the Group B strep test important?

The Group B strep (GBS) test checks for bacteria that may affect your baby during delivery. It’s usually done between weeks 35 and 37.

If the test is positive, you’ll receive antibiotics during labor to keep your baby safe. It’s a simple test with a big impact on newborn health.

What signs suggest labor is approaching in third trimester of pregnancy?

What are signs of labor?

Signs of labor include strong, regular contractions, water breaking, pelvic pressure, back pain, and a “bloody show.” True labor contractions become more intense over time and do not stop with rest.

These signals show that your baby is preparing to make their entrance into the world.

How do practice contractions fit into labor signs?

Braxton Hicks contractions help your body prepare, but they remain irregular and mild. True labor contractions grow stronger, more frequent, and more consistent.

If you’re unsure, timing them can help you determine whether you’re experiencing early labor or practice tightening. When in doubt, contact your care provider.

Frequently Asked Questions About Third Trimester of Pregnancy

What happens in the 3rd stage of pregnancy?

During the third trimester, your baby grows rapidly, organs mature, and your body prepares for labor through hormonal shifts, uterine expansion, and increasing symptoms.

What are signs of labor?

Signs include:

• Strong contractions
• Water breaking
• Bloody show
• Pelvic pressure
• Increased back pain

As you reach the end of pregnancy, you’re making countless decisions to protect your baby. Choosing whether to store your baby’s stem cells is simply another option available to support their future health. It’s not required, and there is no “right” choice—only the one that feels right for your family. Understanding the benefits, asking questions, and learning more during the third trimester ensures that whatever you decide, it will be a confident and loving choice.