Week 33: Immune Transfer
Baby is about the size of Pineapple (434mm head-to-heel)
Maternal antibodies are actively crossing the placenta to your baby, building their immune system for the first months of life. This passive immunity protects against many infections until the baby's own immune system matures. The baby's pupils now constrict and dilate in response to light. Brain development is rapid, with the brain now weighing about 66% of its final birth weight.
You may feel increasingly hot and sweaty as your metabolism is running high. Pelvic pressure increases as the baby grows heavier. Braxton Hicks contractions may occur several times a day. Sleep becomes more fragmented.
What is important now
If you're planning to breastfeed, consider attending a breastfeeding class or consulting with a lactation specialist. Discuss whooping cough (Tdap) vaccination timing with your provider — it's recommended between weeks 27-36 in many countries to pass antibodies to baby.
Common symptoms
- fever above 38C — contact provider
Wellness this week.
Nutrition
Immune transfer and late brain development
- Vitamin C and zinc for immune function
- Continue DHA for rapid brain growth
- Protein-rich foods for baby's final growth phase
- Dates (evidence suggests eating dates from 36 weeks may support cervical ripening)
Exercise
Movement
Gentle daily movement; birth ball exercises are excellent preparation
Sleep
7-9 hours total (including naps)
Position: Left side; accept that sleep will be fragmented
· Nap when possible during the day
· Use a fan for temperature regulation at night
· Fragmented sleep is your body preparing for newborn night waking
Mental wellness
Mindfulness
Frustration with your body is valid. Remember: your body is currently building an immune system for your baby. That's extraordinary.
“Your antibodies are flowing to your baby right now — a gift of protection that lasts for months.”
Your timeline.
Week 6
27 weeks ago- routine
Checkpoint 1 — Mutterpass may be issued upon heartbeat confirmation
Week 19
14 weeks ago- routineWeeks 19–22
Checkpoint 2 — Screening Ultrasound
Choice between a basic biometric scan or detailed organ scan. Measures head circumference, abdominal circumference, femur length, and checks placental position.
GoalAssess fetal anatomy and growth, check for structural abnormalities, and verify placental location.
Week 28
5 weeks ago- routine
Checkpoint 1 — GDM screening
- routine
Checkpoint 2 — Rhogam if Rh-negative
Week 29
4 weeks ago- routineWeeks 29–32
Checkpoint 3 — Screening Ultrasound
Third and final routine ultrasound. Assesses fetal growth, position (cephalic/breech), amniotic fluid volume, and placental function.
GoalConfirm appropriate growth trajectory and baby's position for delivery planning.
Week 35
In 2 weeks- self pay igelWeeks 35–37
Checkpoint 1 — GBS Testing — Self-pay/IGeL
Rectovaginal swab to screen for Group B Streptococcus colonization. If positive, IV antibiotics are given during labor to prevent neonatal infection.
GoalIdentify GBS carriers to enable prophylactic treatment during delivery.
Safety: Fever during pregnancy should always be evaluated. Contact your provider if your temperature exceeds 38°C (100.4°F).
Your journey, your rhythm.
Track your pregnancy week by week with gentle, personalized guidance.