2nd TrimesterMonth 4Week 17 of 40
17 Weeks Pregnant
— How Many Months Is It?
17w
Equivalent to
Month 4
2nd Trimester
🧅
Baby is the size of a
Pomegranate
13 cm (~5.1 in) · 140g
🌱Fetal Development Milestones — Week 17
Adipose tissue (baby fat) begins accumulating to regulate temperature.
Pregnancy timeline progress43%
Week 1Week 17Week 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 17
17 weeks pregnant equals Month 4 of gestation in the 2nd 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.
Adipose tissue (baby fat) begins accumulating to regulate temperature.
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).