2nd TrimesterMonth 5Week 18 of 40
18 Weeks Pregnant
— How Many Months Is It?
18w
Equivalent to
Month 5
2nd Trimester
🫑
Baby is the size of a
Bell Pepper
14.2 cm (~5.6 in) · 190g
🌱Fetal Development Milestones — Week 18
Inner ear bones are developed enough that your baby can hear your voice and heartbeat.
Pregnancy timeline progress45%
Week 1Week 18Week 40
Calculate Your Exact Due Date
Enter your last period date for an instant gestational calculation
212835
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 18
18 weeks pregnant equals Month 5 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.
Inner ear bones are developed enough that your baby can hear your voice and heartbeat.
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).