33 Weeks Pregnant

At a Glance

At 33 weeks, your baby is sturdy, mostly developed, and laying down the fat and immune protections that will support life after birth. For you, the focus narrows to comfort, sleep, monitoring fetal movement, and getting practical preparations in place. There are still 7 weeks to go on average — but be ready, because a meaningful percentage of babies arrive before their due date.

Your Baby's Development This Week

Week 33 is dominated by immune system development, brain growth, and fat deposition. Most of the visible changes from here are about getting ready for the outside world.

• Immune system: Maternal antibodies (IgG) cross the placenta in large amounts in the final 6–8 weeks. This passive immunity protects your baby for the first months of life until their own immune system matures. This is why vaccinations like Tdap and influenza in pregnancy are so protective for newborns.
• Brain: Continues rapid growth. The brain triples in weight during the third trimester. Neural connections are forming at an extraordinary rate.
• Skull: Bones are firm but still flexible and unfused, allowing the head to mold during birth.
• Skin: Less wrinkled and more pink as fat fills underneath. Vernix (the waxy protective coating) is thick.
• Eyes: Pupils constrict and dilate in response to light. The baby spends about 90% of their time with eyes closed, but increasingly opens them when awake.
• Lungs: Producing surfactant; most babies born this week breathe on their own with some support.
• Sleep–wake cycles: Clearer patterns. You may notice the baby is most active in the evening when you slow down.
• Coordination: Movements are purposeful — the baby can reach for the umbilical cord, suck a thumb, and respond to touch through the abdomen.

Your Body and Symptoms This Week

By 33 weeks, the fundal height is about 13 cm above your navel. The combined demands of carrying a nearly 2 kg baby, plus the placenta, amniotic fluid, and expanded blood volume, mean fatigue and discomfort are at their peak.

• Swollen feet and ankles: Especially by the end of the day.
• Pelvic and pubic pain: From loosened ligaments and the baby's weight.
• Lower back pain: From shifted center of gravity and ligament laxity.
• Difficulty sleeping: Frequent urination, discomfort, vivid dreams.
• Heartburn and indigestion: Often worsening.
• Hemorrhoids: From pelvic vein pressure and constipation.
• Shortness of breath: Until the baby drops.
• Stronger Braxton Hicks: Practice contractions may feel intense at times.
• Forgetfulness, "pregnancy brain": Persistent.
• Increased vaginal discharge: Clear or milky white is normal; report any color change, odor, blood, or watery gush.
• Colostrum leakage: Common.
• Carpal tunnel symptoms: Numbness or tingling in fingers.

Nutrition: What to Eat & Avoid This Week

Your baby is gaining about half a pound per week, much of it as fat. Your nutrient needs remain high, with particular emphasis on iron, calcium, omega-3 DHA, and protein.

Prioritize:

• Iron (27 mg/day): Red meat, lentils, beans, fortified cereals, dark leafy greens; pair with vitamin C.
• Calcium (1000 mg/day): Dairy, fortified plant milks, tofu, sardines, broccoli.
• DHA (200–300 mg/day): Salmon, sardines, anchovies; vegetarian options include algae oil supplements.
• Protein (75 g/day): Eggs, fish, poultry, legumes, dairy.
• Choline (450 mg/day): Eggs, lean meat — critical for fetal brain development.
• Fiber: Whole grains, fruits, vegetables — helps constipation and hemorrhoids.
• Hydration: 8–10 glasses of water; may help with swelling, constipation, and Braxton Hicks frequency.

Avoid: Raw or undercooked fish, meat, and eggs; unpasteurized dairy; deli meats unless heated until steaming; high-mercury fish (swordfish, king mackerel, tilefish, shark); alcohol entirely; caffeine above 200 mg/day; herbal teas not confirmed safe in pregnancy.

Movement & Exercise

Most movement remains safe and beneficial in the absence of complications. At 33 weeks, your priorities shift slightly toward labor preparation and mobility maintenance.

Good choices: Walking, prenatal yoga (especially hip openers), swimming, water aerobics, stationary cycling, pelvic tilts, cat-cow, supported squats, and time on a birth ball (sitting, bouncing gently, hip circles). Daily pelvic floor exercises remain important. Perineal massage from 34 weeks can be discussed with your provider.

Avoid: Contact sports, activities with fall risk, scuba diving, hot yoga or saunas, exercise lying flat on your back for extended periods, deep twists, jumping, and any activity that triggers sharp pelvic or back pain. Stop and call your provider for chest pain, severe shortness of breath at rest, dizziness, bleeding, fluid leakage, or regular contractions.

Mental & Emotional Wellbeing

By 33 weeks, anticipation, anxiety, and impatience often coexist. The reality that a baby will soon be in your arms is concrete. Sleep is fragmented, the body is uncomfortable, and the future is uncertain — all valid reasons for emotional intensity.

What helps:

• Finish childbirth classes; the knowledge directly reduces fear
• Practice breathing, visualization, or hypnobirthing techniques
• Discuss postpartum plans with your partner — sleep schedules, household division of labor, visitor boundaries
• Identify your support network for postpartum: who to call, who to text, who can bring food
• Limit dramatic birth content on social media; choose informational sources over fear-based ones
• Talk openly with your provider about birth fears — many can be addressed with information or planning

If anxiety, sadness, or intrusive thoughts persist or worsen, contact your provider. Perinatal mental health is treatable, and treatment now also protects postpartum recovery.

Common Concerns & When to Call Your Doctor

Call your provider the same day for any of:

• Decreased fetal movement — fewer than 10 movements in 2 hours after eating and resting on your left side
• Regular contractions before 37 weeks (4 or more in 20 minutes)
• Lower back pain that comes in rhythmic waves
• Fluid leakage from the vagina (possible water breaking)
• Vaginal bleeding or blood-tinged mucus before 37 weeks
• Severe headache that does not respond to rest and water
• Vision changes — blurriness, spots, or flashes
• Sudden swelling of the face or hands, or swelling in one leg
• Upper-right abdominal pain
• Severe widespread itching, especially on palms and soles
• Fever above 38°C (100.4°F)
• Painful urination

These can indicate preterm labor, preeclampsia, infection, cholestasis, or other conditions that benefit from early evaluation. Babies born at 33 weeks (late moderately preterm) typically do well with brief NICU support.

Tests & Appointments This Week

A typical 33-week visit includes:

• Blood pressure check
• Urine dipstick for protein and glucose
• Weight
• Fundal height measurement
• Fetal heart rate via Doppler
• Palpation to assess baby's position
• Review of fetal movement
• Conversation about labor signs, birth plan, and hospital bag
• Possible third-trimester labs (CBC, infection screens) if not yet done

GBS testing is typically scheduled at 36–37 weeks. If you have specific risk factors (gestational diabetes, hypertension, growth concerns), you may have additional ultrasounds or non-stress tests.

Tips for Week 33

1. Pack your hospital bag now. Keep it by the door or in the car. Include essentials for you, the baby, and your partner.
2. Install the car seat. Get it checked by a certified technician (many fire stations and pediatric clinics offer free inspections).
3. Finalize childcare logistics for older children or pets. Who is on call when you go to the hospital?
4. Discuss your birth preferences. Write down what matters most to you — and what is flexible — and share with your provider.
5. Stock up on postpartum supplies. Pads (regular and large), peri bottle, witch hazel pads, comfortable underwear, nursing bras, breast pads if planning to breastfeed.

Preparing for What's Next

In the next 3–4 weeks you will move into "any day now" territory. While most first babies arrive after their due date, about 11% of births in the U.S. are preterm, so being ready by 36 weeks is wise. Consider:

• Pre-register at your birth facility if available
• Know multiple routes to the hospital and the right entrance to use after hours
• Discuss postpartum support — partner leave, family help, meal trains, postpartum doula
• Plan the first 2 weeks at home — minimal visitors, simple meals, skin-to-skin time
• Confirm pediatrician and the newborn's first appointment (usually 24–72 hours after discharge)
• Discuss postpartum mental health plans — what early warning signs to watch for and who to call
• Take final maternity photos if you want them

Frequently Asked Questions