Trimester 3
33 Weeks Pregnant
In week 33, your baby is putting on weight quickly and fine-tuning their lung and brain function. They are becoming more responsive to light and sound from the outside world as they prepare for the big transition to life outside.
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Your baby is the size of a Pineapple
44 cm
Length
1.9 kg
Weight
Week 1Week 13 - End of Trimester 1Week 27Week 42
Baby's Development This Week
In week 33, your baby is putting on weight quickly and fine-tuning their lung and brain function. They are becoming more responsive to light and sound from the outside world as they prepare for the big transition to life outside.
- The pupils constrict and dilate in response to light.
- Bones continue to harden (except the skull — it stays flexible for birth).
- The immune system is developing with antibodies from the placenta.
- The fetus is accumulating iron stores.
- Brain development is rapid.
- About 43.7cm — the size of a pineapple.
Your Symptoms at Week 33
As you progress through week 33, you may feel more physical strain as your baby grows. Back pain and difficulty finding a comfortable sleeping position are common. Keep your feet up when you can and take pride in how far you've come in this incredible process.
Waddling gait
Wear supportive shoes with low heels. (mild)
Wear supportive shoes with low heels. (mild)
Overheating
Dress in layers; stay in cool environments. (mild)
Dress in layers; stay in cool environments. (mild)
Clumsiness
Take stairs slowly; watch for slippery surfaces. (mild)
Take stairs slowly; watch for slippery surfaces. (mild)
Pelvic pain (SPD)
Pelvic support belt; avoid asymmetric movements. (moderate)
Pelvic support belt; avoid asymmetric movements. (moderate)
When to Call Your Doctor
- Regular contractions before 37 weeks
- Pelvic pain so severe you can't walk
- Fluid gush or steady trickle
- Baby isn't moving as much as usual
Week 33 Checklist
- ✓Attend prenatal visits as scheduled (essential)
- ✓Wash baby clothes and bedding in gentle detergent (recommended)
- ✓Pack snacks and entertainment for your hospital bag (optional)
- ✓Review signs of labor with your partner (essential)
Frequently Asked Questions
Continue Your Pregnancy Journey — Week 33
← →
Week 32 of Pregnancy
Review what happened last week with your baby's development
← →
Week 34 of Pregnancy
What's coming next week — new developments and symptoms to expect
Guide
Third Trimester Overview
Everything happening during your third trimester — symptoms, tests, and milestones
Symptom
Braxton Hicks Contractions
How to tell practice contractions from the real thing
Symptom
Swollen Feet & Ankles
Normal swelling vs. warning signs of preeclampsia
Tool
Kick Counter
Monitor baby kicks — 10 movements in 2 hours is a healthy baseline
Related
Group B Strep Test
Routine test between weeks 35–37 — what a positive result means
Nutrition
Third Trimester Nutrition
Foods for energy, labor prep, and healthy final weight gain
Medical Disclaimer: This content is for informational purposes only and is not a substitute for professional medical advice. Always consult your healthcare provider for personalized guidance about your pregnancy.