Third Trimester Week By Week

The third trimester, spanning from around week 28 to birth, is a period of rapid fetal development and significant physical and emotional changes for the mother. This phase focuses on fetal growth, preparation for birth, and maternal well-being. Understanding week-by-week milestones helps expectant parents feel more informed and prepared for the final stages of pregnancy.

The Final Stretch: Weeks 28-40

Your third trimester is the final leg of your pregnancy journey. It starts around the 28th week. This is when your baby really starts to pack on the pounds.

They are also getting ready for life outside the womb. For you, this means your body is working hard to support this growth. You might feel bigger and more tired.

But you’re also closer than ever to holding your little one.

This period is all about fine-tuning. Your baby’s lungs are maturing. Their brain is developing quickly.

They are practicing skills like sucking and swallowing. Your body is getting ready for labor too. You might notice Braxton Hicks contractions.

Your body is preparing for the big day.

Week 28: The Beginning of the End

Welcome to week 28! Your baby is about the size of a large eggplant. They now weigh about 2.2 pounds.

Their eyes can now open and close. They can also sense light. It’s amazing how much they are growing and changing.

Your uterus now reaches about 8 inches above your belly button. You might start feeling more pressure. This is normal as your baby gets bigger.

Your baby’s skin is becoming less transparent. They are developing a layer of fat underneath. This fat helps them stay warm after birth.

They are also getting more active. You might feel them kicking and stretching more. This is a good sign that they are healthy and growing well.

Your doctor will likely check your iron levels. This is important because your body needs extra iron now.

Week 29: Growing Pains

At 29 weeks, your baby is about the size of a butternut squash. They weigh around 2.5 pounds. Their brain development is accelerating.

They are building billions of neurons. Your baby can now hear sounds from inside and outside your body. They might react to loud noises.

Your body is also feeling the effects. You might experience heartburn more often. This is due to hormones and pressure from your growing uterus.

You may also notice swelling in your feet and ankles. This is common in the third trimester. Try to elevate your legs when you can.

Your baby is practicing breathing by inhaling amniotic fluid. This helps their lungs develop properly. They are also gaining more muscle tone.

This means their movements will feel stronger.

Week 30: Getting Ready

You are now 30 weeks pregnant. Your baby is roughly the size of a head of cauliflower. They weigh about 2.7 pounds.

Their bones are hardening. However, their skull bones remain soft. This helps them pass through the birth canal.

Their lungs are maturing. They are producing surfactant. This is a substance that helps the air sacs in the lungs stay open.

Your baby’s fingernails are growing out. They might even have a little hair.

You might feel your baby’s hiccups. This is a normal part of their development. Your uterus continues to expand.

It is now about 10 inches above your belly button. You may feel more aches and pains. Back pain is very common.

Try to maintain good posture.

Week 31: Fattening Up

At 31 weeks, your baby is about the size of a large bunch of kale. They weigh around 3 pounds. They are gaining body fat.

This fat will help regulate their temperature after birth. Their eyes are fully developed. They can see.

But their vision is still blurry. They are practicing turning their head. This is good practice for their first few months of life.

Your baby is also getting quite cramped in there. Their movements might feel more like stretches and wiggles now.

You may feel more pressure in your pelvic area. This is your baby starting to engage. This means their head is moving lower into your pelvis.

Your breasts might be producing colostrum. This is the early milk. It’s often called “liquid gold.” It’s full of nutrients for your baby.

Week 32: Almost Ready

You are now 32 weeks pregnant. Your baby is about the size of a small pumpkin. They weigh around 3.5 pounds.

Their bones are developing. But they are still somewhat soft and pliable. They are getting longer.

But they are still quite thin. Their lanugo is disappearing. This is the fine downy hair that covered their body.

Most of it has fallen off by now. They continue to practice breathing. They are also developing their sleep-wake cycles.

You might feel stronger kicks and punches. Your baby is getting bigger and stronger. You could also start experiencing more frequent Braxton Hicks contractions.

These feel like practice contractions. They help prepare your uterus for labor. You might feel a bit breathless.

This is because your baby is pressing up against your diaphragm.

Week 33: Getting Cozy

At 33 weeks, your baby is the size of a large pineapple. They weigh about 3.8 pounds. They are continuing to gain fat.

This fat helps insulate their body. It also gives them a chubbier appearance. Their eyelids are now fully formed.

They can blink. Their ears are also developed. They can hear your voice clearly.

Your baby is likely positioned head-down now. This is the optimal position for birth. It’s called the cephalic presentation.

You might feel surges of energy. This is often called nesting instinct. It’s your body’s way of preparing your home for the baby.

Your breasts may feel heavier. They are preparing for breastfeeding. Some women start leaking colostrum now.

It’s perfectly normal. Your belly might feel itchy. This is due to stretching skin.

Week 34: The Final Countdown

You are now 34 weeks pregnant. Your baby is about the size of a cantaloupe. They weigh around 4.2 pounds.

Their lungs are still developing. But they are getting very close to being mature. Their bones are nearly fully formed.

Except for the skull bones. These remain soft. This allows them to fit through your pelvis.

They are losing some of the lanugo. But vernix caseosa, a waxy coating, protects their skin. Your baby is practicing swallowing this vernix.

You might notice your baby’s movements changing. They may be less about big kicks and more about rolls and stretches. This is because they are running out of space.

Your doctor will check your baby’s position at your appointments. They will also check your blood pressure. This is important for detecting preeclampsia.

You might feel more pressure in your pelvis. This is because your baby is settling lower.

Week 35: Readying for Arrival

At 35 weeks, your baby is the size of a honeydew melon. They weigh about 4.5 pounds. Their body systems are maturing.

Their digestive system is ready. They can process milk. Their kidneys are functioning well.

They are producing urine. Your baby is continuing to gain fat. This helps them regulate their body temperature outside the womb.

Their skin is becoming smoother and less wrinkly. Your baby’s head is likely firmly down in your pelvis.

You might feel more discomfort. Your hips and pelvis might ache. This is due to the hormones loosening your ligaments.

They are preparing for birth. Your belly might feel very tight. You may have trouble finding a comfortable sleeping position.

Try using plenty of pillows. Support your belly, back, and legs.

Week 36: Almost There

You are now 36 weeks pregnant. Your baby is about the size of a stalk of Swiss chard. They weigh around 4.8 pounds.

They are considered “full-term” at 39 weeks. But at 36 weeks, they are still developing rapidly. Their lungs are almost mature.

They are developing alveoli. These are the tiny air sacs that help with breathing. Your baby’s brain is growing very fast.

It has many folds now. Their immune system is also getting stronger.

You might experience more frequent Braxton Hicks contractions. They might feel stronger. Some women start to lose their mucus plug.

This is a sign that your cervix is starting to change. It’s a sign labor is getting closer. Your baby is probably head-down.

But some babies still turn around at this stage.

Week 37: Full Term Begins

Congratulations! At 37 weeks, your baby is considered full-term. They weigh about 5.5 pounds.

They are ready for life outside the womb. Their lungs are mature. Their brain is well-developed.

Their digestive system is ready to process milk. Your baby may have more hair now. Or they may be born with little to no hair.

This varies greatly.

You might feel more pressure in your pelvis. This is because your baby has likely dropped. This is when your baby settles deeper into your pelvis.

It can make breathing easier. But it can also increase pressure on your bladder. You might be urinating more frequently.

Your nesting instinct might be strong. You might feel the urge to clean and prepare your home.

Week 38: The Final Weeks

You are now 38 weeks pregnant. Your baby weighs around 6.5 pounds. They are continuing to gain fat.

This fat will help them stay warm after birth. Their skin is losing its vernix. But some may remain.

Their fingernails have probably grown past their fingertips. They might even have scratches on their face. Your baby is getting quite snug.

Their movements might feel different. They may be less about kicking and more about rolling. Your body is getting ready for labor.

Your cervix may start to soften and dilate.

You might feel more tired. Sleep can be challenging. Try to rest when you can.

Your body is working hard. Focus on self-care. Continue to monitor your baby’s movements.

If you notice a significant decrease, contact your doctor.

Week 39: Any Day Now

At 39 weeks, your baby weighs about 7 pounds. They are fully developed. They are ready to be born.

Their body is prepared for life outside the womb. Your baby is likely still moving. But their movements are probably more gentle rolls and stretches.

You might be experiencing more frequent and stronger Braxton Hicks contractions. It can be hard to tell if it’s true labor. Labor signs include regular, intensifying contractions.

Also, water breaking or bloody show.

You might feel a sense of urgency. Or you might feel anxious. It’s okay to feel a mix of emotions.

Your body is going through a lot. Continue to eat well and stay hydrated. Rest is crucial.

Your doctor will want to see you regularly. They will check on you and your baby.

Week 40: Due Date

You’ve reached week 40! This is your estimated due date. Your baby is fully ready.

They can weigh anywhere from 6 to 9 pounds. Some babies arrive on their due date. Many babies arrive within a week or two either side of it.

Your baby might be positioned low in your pelvis. This can make you feel a lot of pressure. Your body is very prepared for labor.

The signs of labor might be very noticeable now. Regular, strong contractions are a key sign.

If your baby hasn’t arrived by your due date, don’t panic. Many babies are born after their due date. Your doctor will discuss your options.

They might recommend induction if necessary. For now, focus on staying calm and patient. Your little one will be here soon.

Take deep breaths. You’ve come so far.

Real-World Context: What to Expect in Daily Life

As you move through the third trimester, daily life changes. Your physical abilities are different. Simple tasks might feel harder.

Bending over to tie your shoes can be a challenge. You might need help getting up from a seated position. Sleep is often interrupted.

Many women find it hard to get comfortable.

Your diet is still important. You need plenty of nutrients for you and the baby. Staying hydrated is key.

It helps with swelling and prevents constipation. Your emotional state can also be a factor. You might feel excited, anxious, or a mix of both.

It’s normal to feel a wide range of emotions.

Carrying a baby this big changes how you move. Your center of gravity shifts. This can affect your balance.

Walking might feel different. You might waddle. Your partner or support person can be very helpful during this time.

Simple gestures like helping you reach something can make a big difference.

What This Means for You: Monitoring and Preparation

The third trimester is a time for increased medical check-ups. Your doctor will monitor your health closely. They will check your blood pressure, weight, and urine.

They will also check the baby’s position and heartbeat. These appointments are crucial. They help ensure everything is progressing well.

This is also the time to finalize your birth plan. Discuss your preferences with your doctor. Pack your hospital bag.

Prepare your home for the baby’s arrival. Learn about newborn care. This preparation can reduce stress.

It helps you feel more in control.

It’s important to listen to your body. Rest when you need to. Don’t push yourself too hard.

If you have any concerns about your pregnancy, don’t hesitate to call your doctor. They are there to support you. They can answer all your questions.

Quick Fixes & Tips for the Third Trimester

For Sleep: Use a pregnancy pillow. Sleep on your side. Try elevating your head.

For Swelling: Elevate your legs. Drink plenty of water. Avoid standing for long periods.

For Heartburn: Eat small, frequent meals. Avoid trigger foods. Stay upright after eating.

For Back Pain: Wear supportive shoes. Practice good posture. Use a heating pad or take warm baths.

For Energy Levels: Rest when you can. Don’t overschedule yourself. Eat nutrient-rich foods.

Frequent Questions About the Third Trimester

When does the third trimester start?

The third trimester of pregnancy officially begins around the 28th week of gestation and continues until your baby is born.

What are the main signs of labor?

Key signs include regular, increasingly strong contractions, your water breaking, and the loss of the mucus plug (bloody show). Changes in fetal movement patterns can also be significant.

Is it normal to feel tired all the time in the third trimester?

Yes, extreme fatigue is very common in the third trimester. Your body is working hard to grow and sustain the baby, which uses a lot of energy. Interrupted sleep also contributes to tiredness.

How much should my baby be moving in the third trimester?

You should feel regular movements from your baby. While the types of movements might change from big kicks to more rolls, a decrease in overall movement could be a reason to contact your healthcare provider.

What is colostrum?

Colostrum is the first milk produced by your breasts. It’s a thick, yellowish fluid packed with nutrients and antibodies. Some women leak it in the third trimester, while others don’t see it until after birth.

When is a baby considered full-term?

A baby is considered full-term from 37 weeks of pregnancy through 40 weeks and 6 days. Babies born within this window are generally well-developed and ready for life outside the womb.

Final Thoughts

The third trimester is a magical time. You are so close to meeting your little one. Each week brings new developments for your baby and new sensations for you.

Stay informed, listen to your body, and lean on your support system. You are doing great!