33 Weeks Pregnant: Baby Development, Symptoms, and What to Expect

By week 33 of pregnancy, you are well into the third trimester and getting close to meeting your baby. This stage combines rapid fetal development with very real physical changes for you, from back discomfort to frequent bathroom trips. Understanding what is happening now can make the final weeks feel more manageable and less uncertain.

Your Baby’s Growth at 33 Weeks

In the early part of the final trimester, your baby is focused on getting bigger, stronger, and more prepared for life outside the uterus. Although exact size varies, many babies around 33 weeks measure roughly 16–17 inches (about 42–43 cm) long and weigh close to 4.5–5 pounds (about 2–2.3 kg).

Brain and Nervous System Maturity

The nervous system is now considered functionally mature, which means your baby’s brain and spinal cord can coordinate more complex movements and responses.

• Billions of neurons are forming and connecting, laying the foundation for learning, memory, and senses after birth.
• Your baby can respond to light, sound, and touch, and may turn or kick in reaction to loud noises or bright light through your abdomen.
• Sleep cycles are more organized, including periods of rapid eye movement (REM) sleep, a stage associated with vivid dreaming.

Lung Development and Breathing Practice

One of the most important jobs of late pregnancy is lung maturation. By 33 weeks, the lungs are close to being ready but still benefit from extra time inside the womb.

• Air sacs in the lungs are lined with surfactant, a substance that keeps them from collapsing when your baby takes breaths after birth.
• Your baby practices breathing by rhythmically moving the chest and diaphragm, even though there is only amniotic fluid in the lungs right now.
• Each week in this period improves breathing ability and reduces the risk of complications if birth happens early.

Body Changes: Fat, Skin, and Bones

From now until birth, your baby is building up fat and smoothing out earlier, more delicate features.

• Body fat increases, giving your baby a rounder appearance and helping with temperature control after birth.
• The skin becomes less wrinkled and more opaque as fat accumulates underneath.
• Most bones are hardening, but the skull remains soft and flexible so the head can fit through the birth canal more safely.

What You May Feel in Your Own Body

By week 33, your uterus sits well above your belly button, and the extra weight and shifting posture can lead to new or intensified symptoms.

Common Third-Trimester Symptoms at 33 Weeks

• Backache and pelvic pressure from the weight of the uterus and changes in your center of gravity.
• Shortness of breath as the growing uterus presses upward against the diaphragm.
• Frequent urination due to increased pressure on the bladder.
• Leg cramps and restless legs, especially at night.
• Heartburn and indigestion as hormones relax the muscles that keep stomach acid in place.
• Swelling in feet and ankles, often worse at the end of the day, due to fluid shifts and pressure on blood vessels.

Many people also notice their total weight gain is now around 10–13 kg (22–28 pounds), depending on pre-pregnancy size and health; your own recommended range should come from your prenatal care provider.

Baby’s Movements: What Is Normal Now?

Although there is less room, your baby should still move regularly at 33 weeks. Instead of sudden flips, you are more likely to feel rolls, stretches, and strong jabs.

• Movements should stay consistent in pattern, even if they feel different as space gets tighter.
• Many providers suggest paying attention to periods when your baby is usually active, such as after meals or in the evening.
• If you notice a clear decrease or absence of movement, contact your provider promptly.

Health Checkpoints at Week 33

Regular prenatal visits are essential throughout the third trimester. Your care team uses these appointments to monitor both your health and your baby’s well-being.

What Your Provider May Monitor

• Blood pressure to screen for conditions like preeclampsia, which involves high blood pressure and can affect the liver, kidneys, and placenta.
• Urine tests to look for protein, infection, or signs of high blood sugar.
• Fundal height (the height of the uterus) to estimate growth and fluid levels.
• Baby’s position (head down, sideways, or breech) as you move closer to term.
• Heart rate and movement using a Doppler device or other monitoring as needed.

Many people also have screening for conditions such as gestational diabetes earlier in the third trimester, as well as testing for group B strep closer to term, depending on local guidelines and your specific situation.

Signs of Possible Preterm Labor

Birth before 37 completed weeks of pregnancy is considered preterm. Recognizing warning signs earlier allows for faster evaluation and treatment, which can improve outcomes.

• Regular contractions or tightening of the uterus that do not fade with rest.
• Menstrual-like cramps or pressure low in the pelvis or back.
• A gush or steady trickle of fluid from the vagina, which may suggest that the amniotic sac has broken.
• Change in vaginal discharge, especially if it becomes watery, mucus-like, or tinged with blood.
• Persistent low back pain that feels different from usual soreness.

If you have any of these symptoms, contact your hospital, clinic, or midwife urgently for advice on what to do next.

Taking Care of Yourself at 33 Weeks

The last weeks of pregnancy are physically demanding. Simple habits can make a meaningful difference for your comfort and energy.

Nutrition and Hydration

• Aim for balanced meals with vegetables, fruits, whole grains, protein, and healthy fats.
• Keep drinking water throughout the day; good hydration supports blood volume, amniotic fluid, and digestion.
• Smaller, more frequent meals can reduce heartburn and nausea.
• Try to include sources of iron, calcium, and omega-3 fats (like leafy greens, dairy or fortified alternatives, and certain fish or plant sources) as recommended by your provider.

Safe Activity and Rest

• Unless your provider tells you otherwise, moderate activity such as walking or prenatal yoga can support circulation, mood, and sleep.
• Change positions slowly to avoid dizziness and support your joints.
• For sleep, many people find it more comfortable to lie on the left side with pillows between the knees and under the belly to ease back strain.
• Short daytime rests can help if you are waking often at night.

Getting Ready for Birth and Life With Baby

Week 33 is an excellent time to turn your attention from earlier planning to more concrete preparations for labor, birth, and the first days at home.

Birth Preferences and Support

• Review any birth plan or preferences you have and discuss them with your provider so expectations are clear.
• Think about who you would like with you in labor—partner, family member, doula, or close friend.
• If you plan to use pain relief during labor, ask about options available in your hospital or birth center.

Practical To-Do List

• Prepare a hospital bag with comfortable clothing, toiletries, documents, and items for baby such as clothes and a blanket.
• Install an infant car seat according to manufacturer and safety guidelines, and consider having it checked at a certified inspection station where available.
• Organize a safe sleep space, such as a crib or bassinet with a firm mattress and fitted sheet, keeping the area free of loose bedding and soft objects.
• Arrange help for the first weeks at home if possible—this may include childcare for older children, meal support, or assistance with chores.

Emotional Well-Being in the Final Stretch

It is very common to experience mixed feelings—excitement, impatience, nervousness, or even sadness—at this stage. Hormonal shifts and physical discomfort can intensify emotions.

• Sharing your feelings with a trusted partner, friend, or support group can reduce stress.
• Simple relaxation practices—deep breathing, gentle stretching, or guided imagery—can help with anxiety around birth or parenting.
• If you feel persistently low, very anxious, or find it hard to manage daily life, speak with your provider about emotional support or mental health care; mood difficulties can arise during pregnancy, not only after birth.

Frequently Asked Questions About Week 33

Is my baby fully developed at 33 weeks?

Your baby’s brain and nervous system are functionally mature, and most major organs are formed, but the lungs and immune system still benefit greatly from more time in the uterus. Each additional week in the third trimester helps your baby grow, store fat, and refine organ function.

How can I tell if my baby is head down?

By 33–36 weeks, many babies move into a head-down position, though some will turn later. You might feel stronger kicks higher in your abdomen and pressure lower in your pelvis. The most reliable way to know is through a physical exam or ultrasound at your prenatal visit.

Is it normal to feel fewer big kicks now?

As your baby grows and fills more of the uterus, movements often change from large flips to more rolls, stretches, and jabs. The overall pattern of activity should remain similar. If your baby seems significantly less active or you are worried, contact your provider for guidance.

What should I do if I think my water has broken?

If you experience a sudden gush or a steady trickle of fluid from your vagina that you cannot control, call your hospital or provider right away. Even if contractions have not started, a broken amniotic sac usually needs prompt assessment due to infection risk and to plan next steps for birth.

Can I still travel at 33 weeks?

Travel decisions at this stage are individual and depend on your health, pregnancy history, and your provider’s advice. Some airlines and transport services limit travel late in pregnancy. If travel is necessary, talk with your provider first, carry your medical information, move around regularly to support circulation, and know where you could get care at your destination.