Third Trimester
40 Weeks Pregnant
Your baby is the size of a Watermelon 🍉
🍉
Medically reviewed by
MBBS, MD — Gynecologist & Obstetrician
Last reviewed:
Feb 2026
📏
Size
Watermelon
📐
Length
51.2 cm cm
⚖️
Weight
NaN g
🗓️
Trimester
Third
⏱️
Week
40 of 40
🌱 Baby Development at Week 40
DUE DATE WEEK! Baby is fully developed. Average birth weight is 7.5 lbs (3.4 kg). Brain will continue developing for years. Baby's skin is smooth — vernix mostly absorbed. Lungs fully mature and ready for first breath.
DUE DATE WEEK! 🎂Fully developedAverage 7.5 lbs birth weight
🤱 Common Symptoms
●Strong contractions may begin
●Water may break
●Cervix fully effaced and dilating
●Pelvic pressure
●Back labor possible
🥗 Nutrition Tips
- Light snacks for labor energy
- Honey and banana for energy
- Hydrate during early labor
🏃♀️ Exercise Tips
- Walking during early labor
- Warm bath for pain relief
- Hip circles on birth ball
🏥 Medical Tests & Appointments
Due date! Contact your provider when contractions are regularNon-stress test if overdueDiscuss induction if approaching 42 weeks
🔬 Hormone Changes
Full oxytocin surge triggers uterine contractions. Cortisol from fetal lungs signals respiratory readiness. Endorphins rise in labor.
Frequently Asked Questions
Common questions answered by our medical team