Seven weeks to go. Your baby is rounding out fast, your belly is unmistakably full-term in shape, and the reality of birth is starting to feel very close. Week 33 is a significant one: your baby is crossing the 1.9-kilogram mark, and the immune system is actively receiving its first line of defense from you. The days of theoretical parenting are becoming something much more concrete.
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Your Baby This Week
Size: Pineapple — about 43.7 cm (head to toe)
Weight: About 1.9 kilograms
Your baby is growing by about 200–250 grams per week now. Here's what's happening developmentally:
- Immune system is being built. You are actively transferring antibodies to your baby through the placenta — a process called passive immunity. These antibodies will protect your newborn against infections in the first weeks of life, before their own immune system is mature enough to mount a defense. This transfer accelerates significantly in the last trimester.
- Bones are almost fully hardened. The skull remains pliable and made up of separate plates that can overlap slightly during birth (called molding), but the rest of the skeleton has largely completed ossification.
- Brain development continues rapidly. The cerebral cortex is developing its characteristic folds (gyrification), dramatically expanding the surface area for cognitive function. This process continues through early childhood.
- Eyes are practicing. Your baby can detect light filtering through the uterine wall and will blink in response. The pupils can now constrict and dilate, and the irises are capable of responding to light.
- Sleep cycles are established. Your baby spends most of the day in REM sleep — important for brain development. You'll notice defined periods of movement and rest, which often differ from your own sleep schedule.
- Skin is smoothing out. The lanugo (fine body hair that kept your baby warm earlier in development) is starting to disappear. The skin is becoming less translucent as fat continues to accumulate underneath.
Your Body This Week
Week 33 brings a combination of discomforts that are directly related to how much space your baby is taking up:
- Shortness of breath. Your uterus is pushing upward against your diaphragm. Deep breathing becomes harder, and you may find yourself winded from minor exertion. This typically eases once the baby drops into your pelvis in the coming weeks.
- Heartburn. The same pressure on your stomach slows digestion and pushes stomach acid upward. Smaller, more frequent meals and avoiding lying down after eating can help. Your provider may recommend an antacid that's safe for pregnancy.
- Frequent urination. Continued pressure on the bladder. There's not much to be done except staying hydrated (cutting fluids won't help and will make other symptoms worse).
- Swollen ankles and feet. Dependent edema is normal at this stage. Elevation, compression socks, and avoiding prolonged standing help. If swelling is sudden, severe, or involves the face and hands, contact your provider.
- Braxton Hicks contractions. These practice contractions are becoming more noticeable. They're irregular, don't increase in intensity, and ease with movement or a change of position. True labor contractions follow a regular pattern and get stronger over time.
- Backache. Your center of gravity has shifted considerably. Supportive footwear, a pregnancy pillow at night, and gentle prenatal yoga or stretching make a meaningful difference.
Tips for Week 33
1. Do your kick counts consistently. A healthy baby at 33 weeks should move regularly. The standard recommendation is to note the time it takes to feel 10 movements during a period when your baby is normally active. If it takes longer than 2 hours, call your provider. Don't wait and see.
2. Start looking at your birth preferences. You don't need to have every decision locked in, but week 33 is a good time to review your options. Talk with your provider about what labor support, pain management, and delivery preferences look like in your birth setting.
3. Take an infant CPR class. These are widely available, usually 2–3 hours, and give you skills you'll have for the rest of your life. Many hospitals and community organizations offer them at low or no cost.
4. Review your maternity leave plan. Whether you're employed or self-employed, tying up loose ends at work now — rather than in the final two weeks — leaves you less stressed and better rested going into labor.
5. Sleep in positions that support circulation. Left-side sleeping remains the recommendation in late pregnancy. A pillow between your knees and another behind your back can make it more sustainable through the night.
6. Keep up with prenatal appointments. At 33 weeks, most providers are seeing you every two weeks. These appointments monitor blood pressure, fetal growth, and position. Don't skip them even if everything feels normal.
When to Call Your Doctor
- Decreased fetal movement — fewer than 10 movements in 2 hours during a normally active period warrants a call, not a wait-and-see approach
- Signs of preeclampsia: severe headache, visual disturbances (blurring, floaters, flashing lights), sudden facial or hand swelling, or pain in the upper right abdomen
- Contractions before 37 weeks that are regular, getting stronger, or coming more than 4–6 times per hour — this needs same-day evaluation to rule out preterm labor
- Any vaginal bleeding (not just spotting after an exam)
- Fluid leaking from the vagina — could indicate premature rupture of membranes
- High fever, chills, or signs of infection
Related Tools & Articles
- Due Date Calculator — Calculate your estimated due date
- Contraction Timer — learn how to use it before you need it
- Hospital Bag Checklist — start pulling this together
- Pregnancy Week 34 — what's coming next
- Pregnancy Week-by-Week Overview — full timeline