Your Guide to the Third Trimester of Pregnancy

The third trimester is the final stretch of your pregnancy, from week 28 until your baby's arrival. This guide from Param Maternity & Surgical Nursing Home helps you understand what to expect, common changes, important check-ups, and how to prepare for labor and delivery.

Published: July 29, 2024•Updated: July 29, 2024

Welcome to Your Third Trimester!

Congratulations on reaching the final stage of your pregnancy! The third trimester, spanning from 28 weeks until your baby's birth, is a time of rapid growth for your little one and significant changes for your body as you prepare for labor and delivery. At Param Maternity & Surgical Nursing Home, we're here to support you every step of the way, helping you feel informed, confident, and ready for this exciting journey.

What is the Third Trimester?

The third trimester officially begins at 28 weeks and 0 days of gestation and continues until your baby is born. While a full-term pregnancy is typically considered between 37 and 42 weeks, this period is characterized by your baby's final growth spurt and the maturation of their vital organs, especially the lungs and brain. Your body also undergoes crucial adaptations, preparing for the incredible process of childbirth and breastfeeding.

Your Body's Journey: What to Expect

As your pregnancy progresses, you'll notice several physiological changes, driven by your baby's growth and a complex interplay of hormones preparing your body for birth.

Common Physical Changes:

Braxton Hicks Contractions: You might feel irregular, non-progressive uterine tightenings. These are often called 'practice contractions' and are a normal part of your body preparing for labor.
Musculoskeletal Discomfort: Backaches, pelvic pressure, and even sciatica can become more noticeable as your baby grows and your ligaments soften.
Shortness of Breath: Your expanding uterus can press on your diaphragm, making breathing feel a bit more challenging.
Digestive Issues: Heartburn (acid reflux) and constipation are common due to hormonal changes and pressure from your uterus.
Frequent Urination: Your baby's head pressing on your bladder means more trips to the restroom.
Swelling (Edema): Mild swelling in your ankles, feet, and hands is common. Varicose veins and hemorrhoids can also develop or worsen.
Fatigue and Sleep Difficulties: Carrying extra weight and discomfort can make getting a good night's sleep challenging.
Nesting Instinct: You might feel a sudden urge to clean, organize, and prepare your home for the baby's arrival.
Breast Changes: Your breasts are preparing for feeding, and you might notice leakage of colostrum, the nutrient-rich first milk.

Your Baby's Final Growth Spurt:

During these last weeks, your baby gains most of their weight and continues to develop rapidly. Their lungs mature, the brain undergoes significant development, and they store fat, which helps regulate body temperature after birth. Hormones like estrogen and oxytocin receptors increase, preparing your uterus for contractions, while prolactin levels rise to get your breasts ready for milk production. The exact trigger for labor is a fascinating combination of signals from both you and your baby.

Important Check-ups and Tests

Regular antenatal care is vital in the third trimester to monitor both your health and your baby's well-being. Your appointments will become more frequent as you near your due date.

Routine Visits Include:

Maternal Assessment: We'll check your blood pressure, weight, and assess for any swelling.
Fetal Monitoring: We'll measure your fundal height (the distance from your pubic bone to the top of your uterus) to track your baby's growth, listen to their heart rate, and determine their position (head down, breech, etc.).
Fetal Movement: You'll be encouraged to monitor your baby's movements, often referred to as 'kick counts', to ensure their well-being.
Cervical Examination: This may be performed as you get closer to your due date or if there are concerns about preterm labor, to check for cervical changes.

Key Screenings and Tests:

Group B Streptococcus (GBS) Screening: A vaginal and rectal swab is typically collected between 36 and 37 weeks of pregnancy. This screens for a common bacterium that can, in rare cases, cause infection in newborns. If you test positive, antibiotics will be recommended during labor to protect your baby. It's worth noting that while organizations like ACOG recommend universal screening, others like RCOG/NICE suggest a risk-factor-based approach for antibiotic prophylaxis.
Urine Dipstick: At each visit, your urine will be checked for protein (a sign of pre-eclampsia) and sugar (a sign of gestational diabetes).
Complete Blood Count (CBC): This blood test helps re-check for anemia, which can be common in pregnancy.
Gestational Diabetes Screening: While usually done between 24-28 weeks, it may be repeated if indicated.

When Ultrasound Might Be Used:

Ultrasound scans are not routine for all low-risk pregnancies in the third trimester but may be recommended for specific reasons, such as:

Assessing fetal growth if there's concern about your baby being too small (Intrauterine Growth Restriction) or too large (macrosomia).
Checking the amount of amniotic fluid.
Confirming your baby's position.
Performing a Biophysical Profile (BPP) or Non-Stress Test (NST) to assess fetal well-being.
Confirming the placenta's location if there was an earlier concern like placenta previa.

Staying Healthy and Comfortable

Taking care of yourself is more important than ever in these final weeks. Simple lifestyle adjustments can make a big difference.

Balanced Diet: Continue eating a nutritious, balanced diet. Small, frequent meals can help manage heartburn and nausea.
Gentle Exercise: Unless advised otherwise by your doctor, continue moderate exercise like walking or swimming. Listen to your body and don't overexert yourself.
Rest and Sleep: Prioritize rest. Sleeping on your left side is often recommended to improve circulation to your baby and reduce swelling. Use pillows for support between your knees or under your belly.
Managing Discomforts: Elevate your legs to reduce swelling, wear supportive bras, and practice good posture to ease back pain.
Supplements and Vaccinations: Continue your prenatal vitamins. Your doctor will also recommend the Tdap vaccine (for whooping cough) between 27-36 weeks and the influenza vaccine if it's flu season.

Recognizing Warning Signs: When to Contact Us Immediately

While many third-trimester symptoms are normal, some can indicate a serious problem. It's crucial to know when to seek immediate medical attention. Please contact Param Maternity & Surgical Nursing Home or go to the nearest emergency room if you experience any of the following:

Vaginal Bleeding: Any amount of vaginal bleeding requires immediate evaluation.
Signs of Pre-eclampsia: This includes severe or persistent headache, visual changes (blurry vision, flashing lights, spots), severe pain in the upper abdomen (especially under the ribs on the right side), or sudden and severe swelling (particularly in your face or hands).
Signs of Labor (especially if preterm): Regular, progressively stronger, and more frequent contractions, especially if you are less than 37 weeks pregnant.
Rupture of Membranes: A gush or steady trickle of fluid from your vagina, which could indicate your water has broken.
Decreased Fetal Movement: A significant reduction or absence of your baby's usual pattern of movements. Trust your instincts – if something feels off, get it checked.
Fever or Signs of Infection: A fever above 38°C (100.4°F), chills, or other signs of infection.

Understanding Potential Complications

While most pregnancies are uncomplicated, it's helpful to be aware of potential issues that can arise in the third trimester. Early detection and management are key.

For the Mother:

Hypertensive Disorders: Conditions like gestational hypertension, pre-eclampsia, and in severe cases, eclampsia or HELLP syndrome. These can have long-term implications for cardiovascular health.
Hemorrhage: Complications such as placental abruption (placenta detaching too early) or placenta previa (placenta covering the cervix), and postpartum hemorrhage after delivery.
Labor Complications: Preterm labor, prolonged labor, or the need for a Cesarean delivery.
Infection: Such as chorioamnionitis (infection of the amniotic fluid and membranes).
Thromboembolism: Blood clots like deep vein thrombosis (DVT) or pulmonary embolism (PE).

For the Baby:

Growth Abnormalities: Intrauterine growth restriction (IUGR) where the baby is too small, or macrosomia where the baby is too large.
Prematurity: Being born before 37 weeks can lead to complications like respiratory distress syndrome or intraventricular hemorrhage.
Stillbirth: The tragic loss of a baby before birth.
Amniotic Fluid Issues: Too little (oligohydramnios) or too much (polyhydramnios) amniotic fluid.
Malpresentation: The baby being in an abnormal position for birth, such as breech (feet or bottom first) or transverse lie (sideways).
Neonatal GBS Infection: If GBS is passed from mother to baby during birth.

Preventing Complications

Many complications can be prevented or managed effectively with proactive care.

Healthy Lifestyle: Maintaining a healthy weight before pregnancy, avoiding smoking, alcohol, and illicit drugs are crucial primary prevention steps.
Vaccinations: Ensuring you receive recommended vaccines like Tdap and influenza during pregnancy.
Regular Antenatal Care: Consistent check-ups allow your healthcare team to monitor your blood pressure, fetal growth, and screen for conditions like gestational diabetes and GBS.
Patient Education: Knowing the warning signs and reporting them promptly is vital.
Fetal Movement Counting: Regularly monitoring your baby's movements helps you identify any changes that need medical attention.
Low-dose Aspirin: For individuals at high risk of pre-eclampsia, low-dose aspirin may be recommended, often started in the first or early second trimester.

Preparing for Labor and Delivery

The third trimester culminates in the incredible experience of labor and delivery. For most low-risk pregnancies, the prognosis for both mother and baby is excellent, with spontaneous labor typically occurring between 37 and 42 weeks.

If your pregnancy extends beyond 42 weeks (post-term), your doctor may recommend inducing labor due to increased risks for both you and your baby. It's also important to know that certain pregnancy complications, like pre-eclampsia and gestational diabetes, can increase your lifetime risk of cardiovascular disease and type 2 diabetes, respectively, highlighting the importance of continued health monitoring after birth.

We encourage you to discuss your birth preferences, pain management options, and any concerns you have with your healthcare provider at Param Maternity & Surgical Nursing Home. We are here to ensure you have a safe and positive birthing experience.

Frequently Asked Questions

How can I differentiate between Braxton Hicks contractions and true labor contractions?

Braxton Hicks contractions are irregular, often non-progressive uterine tightenings that don't get stronger or closer together. True labor contractions, on the other hand, are regular, become progressively stronger, last longer, and occur more frequently. If you're unsure, especially if you're before 37 weeks, it's always best to contact your healthcare provider.

What are the definitive signs that I am in labor?

Definitive signs of labor include regular, progressively stronger and more frequent contractions, rupture of membranes (your 'water breaking' – a gush or steady trickle of fluid), and cervical changes (dilation and effacement) confirmed by examination. If you experience these, contact your provider.

At what point should I contact my provider or go to the hospital?

You should contact your provider or go to the hospital if you experience any red flag symptoms like vaginal bleeding, severe headache or visual changes, sudden severe swelling, decreased fetal movement, rupture of membranes, or regular, painful contractions, especially if you are preterm (before 37 weeks).

How often should I be feeling my baby move each day?

While there's no universal 'magic number,' it's important to know your baby's normal pattern of movement. Many providers suggest that you should feel at least 10 movements (kicks, flutters, rolls) within a 2-hour period, especially when you focus on counting. Consistency in pattern is more important than a specific number.

What should I do if I notice a decrease in my baby's movements?

If you notice a significant reduction or absence of your baby's perceived movements from their normal pattern, you should contact your healthcare provider immediately. Do not wait; this requires prompt evaluation.

Is it safe to have sexual intercourse during the third trimester?

For most uncomplicated pregnancies, sexual intercourse is generally safe throughout the third trimester. However, it's important to avoid it if you have certain conditions like placenta previa, premature rupture of membranes, or if your doctor has advised against it. Always consult your healthcare provider if you have any concerns.

Are there any travel restrictions, particularly for flying, late in pregnancy?

Many airlines have restrictions for flying late in pregnancy, often after 36 weeks for domestic flights and earlier for international flights. It's important to check with your airline and consult your healthcare provider about any travel plans, especially if you have a high-risk pregnancy or potential complications.

What is a birth plan and what key elements should it include?

A birth plan is a written document outlining your preferences for labor, delivery, and immediate postpartum care. Key elements can include your preferences for pain management (e.g., epidural, natural methods), who you want present, positions for labor, interventions you wish to avoid, and initial newborn care (e.g., skin-to-skin, breastfeeding). It's a guide for discussion with your medical team.

What are my options for pain management during labor and delivery?

Pain management options during labor and delivery can include non-pharmacological methods (e.g., breathing techniques, massage, hydrotherapy, movement) and pharmacological methods (e.g., epidural, spinal block, nitrous oxide, IV pain medication). Discuss these options with your healthcare provider to understand what's best for you.

What is Group B Strep (GBS) and why is testing and treatment important?

Group B Streptococcus (GBS) is a common bacterium that can live in the vagina or rectum without causing harm to the mother. However, if passed to the baby during birth, it can cause serious infection. Testing (a swab between 36-37 weeks) identifies carriers, and if positive, intrapartum antibiotic prophylaxis (typically penicillin) is given during labor to significantly reduce the risk of neonatal GBS infection.

What are the risks and benefits of an epidural?

An epidural is a common and effective method of pain relief during labor. Benefits include significant pain reduction, allowing rest, and potentially helping manage a prolonged labor. Risks are generally low but can include a drop in blood pressure, fever, itching, headache, and in rare cases, nerve damage or infection. Your anesthesiologist will discuss these with you.

What is an episiotomy and under what circumstances is it performed?

An episiotomy is a surgical incision made in the perineum (the tissue between the vagina and anus) to enlarge the vaginal opening during childbirth. It is not routinely performed but may be done in specific circumstances, such as when there is a need to expedite delivery (e.g., fetal distress) or to prevent a more severe tear.

What happens if my pregnancy goes past my due date?

If your pregnancy goes past your due date (post-term, typically beyond 42 weeks), your healthcare provider will closely monitor you and your baby. Risks can increase, such as placental insufficiency or macrosomia. Induction of labor is often recommended to reduce these risks and ensure a safe delivery.

What are the common medical reasons for inducing labor?

Common medical reasons for inducing labor include post-term pregnancy (past 42 weeks), pre-eclampsia or gestational hypertension, gestational diabetes, premature rupture of membranes without labor, fetal growth restriction, or other maternal or fetal health concerns where continuing the pregnancy poses a greater risk.

What are the primary indications for a planned or emergency Cesarean section?

Primary indications for a planned Cesarean section can include placenta previa, certain fetal malpresentations (e.g., breech), multiple gestations, or previous uterine surgery. Emergency C-sections are performed for situations like fetal distress, placental abruption, cord prolapse, or failure of labor to progress.

How can I best prepare for breastfeeding while still pregnant?

You can prepare for breastfeeding by attending antenatal classes, reading reliable resources, and discussing your feeding plans with your healthcare provider. Learning about proper latch, feeding cues, and common challenges can help build your confidence. Your breasts are already preparing by producing colostrum.

What are the essential items to pack in a hospital bag for myself and the baby?

For yourself, consider comfortable clothing, toiletries, nursing bras, and any personal items that bring comfort. For the baby, pack a going-home outfit, a car seat (already installed), and a few diapers. Don't forget important documents, snacks, and chargers for electronics. A detailed list can be provided by your hospital.

When should I be concerned about swelling in my hands, feet, or face?

Mild swelling in the ankles and feet is common. However, sudden and severe swelling, especially in your face or hands, can be a warning sign of pre-eclampsia. If you experience this, or if swelling is accompanied by a severe headache or visual changes, contact your healthcare provider immediately.

What sleeping positions are safest for me and the baby?

Sleeping on your side, particularly your left side, is generally recommended in the third trimester. This position helps improve blood flow to your uterus and baby and can reduce swelling. Using pillows for support between your knees or under your belly can enhance comfort.

What types of exercise are safe to continue in the third trimester?

Safe exercises in the third trimester include walking, swimming, prenatal yoga, and stationary cycling, as long as you feel comfortable and your doctor approves. Avoid activities with a risk of falling or abdominal trauma. Listen to your body, stay hydrated, and avoid overheating.

How can I manage severe heartburn or acid reflux?

To manage heartburn, try eating smaller, more frequent meals, avoiding spicy or fatty foods, staying upright after eating, and elevating your head while sleeping. Over-the-counter antacids may be recommended by your doctor. If severe, discuss prescription options with your provider.

What is colostrum and is it normal for my breasts to leak?

Colostrum is the nutrient-rich 'first milk' produced by your breasts, often yellowish and thick. It's packed with antibodies and essential nutrients for your newborn. It is completely normal for your breasts to leak colostrum during the third trimester as your body prepares for breastfeeding.