Third Trimester
39 Weeks Pregnant
Your baby is the size of a Mini watermelon 🍉
🍉
Medically reviewed by
MBBS, MD — Gynecologist & Obstetrician
Last reviewed:
Feb 2026
📏
Size
Mini watermelon
📐
Length
50.7 cm cm
⚖️
Weight
NaN g
🗓️
Trimester
Third
⏱️
Week
39 of 40
🌱 Baby Development at Week 39
FULL TERM (optimal). Studies show 39 weeks is the safest time for birth. All systems go! Baby has a firm grip. Skull is malleable for birth. Vernix caseosa will lubricate baby during delivery. Immune system primed and ready.
OPTIMAL BIRTH WEEK 🌟All systems readyCervix dilating
🤱 Common Symptoms
●Cervix dilating and effacing
●Contractions may begin
●Mucus plug passage
●Loose stools (natural labor prep)
●Strong nesting urge
🥗 Nutrition Tips
- Light easily digestible labor food
- Coconut water for electrolytes
- Avoid large meals
🏃♀️ Exercise Tips
- Walking to encourage labor
- Nipple stimulation (with provider advice) to increase oxytocin
- Rest and stay calm
🏥 Medical Tests & Appointments
Weekly appointmentsDiscuss induction if no labor begins soon
🔬 Hormone Changes
Progesterone sharply declines. Oxytocin, prostaglandins, and estrogen surge triggering labor. CRH from fetal lungs signals readiness.
Frequently Asked Questions
Common questions answered by our medical team