3rd TrimesterMonth 8Week 31 of 40
31 Weeks Pregnant
— How Many Months Is It?
31w
Equivalent to
Month 8
3rd Trimester
🥥
Baby is the size of a
Coconut
41.1 cm (~16.2 in) · 1.5 kg
🌱Fetal Development Milestones — Week 31
Brain development surges and all five senses are functioning. Movements feel like rolling.
Pregnancy timeline progress78%
Week 1Week 31Week 40
Calculate Your Exact Due Date
Enter your last period date for an instant gestational calculation
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Enter your date to calculate gestational age.
Based on ACOG guidelines and Naegele's Rule for informational purposes only. Consult your OB-GYN.
Frequently Asked Questions — Week 31
31 weeks pregnant equals Month 8 of gestation in the 3rd Trimester. Because calendar months vary between 28 and 31 days while weeks are exactly 7 days, clinical tracking in weeks provides the most accurate timeline.
Brain development surges and all five senses are functioning. Movements feel like rolling.
Use the calculator above: enter the first day of your last period (LMP) and the tool will calculate your exact estimated due date using Naegele\'s Rule (LMP + 280 days).