Last updated: January 2026
At 33 weeks, you're counting down the final weeks and may even be experiencing "nesting" - that burst of energy to clean and organize before baby arrives! Your baby is now the size of a pineapple (44 cm, 1.8 kg), with a fully developed brain and nervous system, and distinct sleep-wake cycles with REM sleep. If baby has dropped into your pelvis, you may notice some relief from breathlessness but more pelvic pressure.
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| Measurement | Details |
|---|---|
| **Length** | About 44 cm (17.3 inches) |
| **Weight** | Approximately 1.8 kg (4 pounds) |
| **Size comparison** | Like a pineapple (ananas) |
Brain and Nervous System:
Bones:
Sleep Patterns:
Movement:
| Symptom | Why It Happens | What Helps |
|---|---|---|
| Easier breathing | Baby may have dropped | Enjoy it! |
| Pelvic pressure | Baby's head in pelvis | Rest, pelvic floor exercises |
| Braxton Hicks | Practice contractions | Rest, hydration |
| Costochondritis | Baby pushing on ribs | Position changes, support |
| Insomnia | Hormones, discomfort | Sleep routine, cool room |
| Anxiety about birth | Normal emotional response | Talk to someone, classes |
You May Notice:
This Doesn't Mean Labor is Imminent:
Why It Happens:
What Helps:
Daily Tracking:
What Counts as Movement:
Why It Matters:
How to Do Kegel Exercises:
Benefits:
Techniques:
You're in the final stretch - it's okay to:
Prioritize:
Things to Organize:
A burst of energy where you want to:
Why It Happens:
Be Careful:
Contact Doctor Immediately If:
Talk to Doctor About:
A: Baby has less room now, so movements feel different - more jabs and pokes than big kicks. What matters is YOUR baby's pattern. Should still feel 10+ movements per day. If movement significantly decreases or pattern changes, contact your doctor immediately.
A: Nesting doesn't predict when labor will start. It's a normal hormonal and psychological response in late pregnancy. Some women nest for weeks before delivery, some don't nest at all. Don't let nesting tire you out - save energy for labor!
A: Insomnia is very common in third trimester. Try: exercise during day, avoid heavy meals at night, cut caffeine, take warm bath before bed, keep room cool, use supportive pillows, maintain regular sleep schedule. If it severely affects daily functioning, talk to your doctor.
A: Fontanelles (soft spots on baby's skull) are meant to be soft! They allow baby's head to mold during birth and accommodate brain growth after birth. They're protected by a tough membrane. Handle gently but don't worry - they're designed this way.
A: Ideally throughout pregnancy, but starting now is still helpful! Pelvic floor exercises (Kegel) help prevent leakage, prepare for birth, and speed recovery. It's never too late to start. Do them 3 times daily - you can do them anywhere, anytime.
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This article was reviewed by a healthcare provider. At 33 weeks, your baby's brain and nervous system are fully developed - the final weeks are about growing and preparing for birth!
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