2nd TrimesterMonth 5Week 21 of 40
21 Weeks Pregnant
— How Many Months Is It?
21w
Equivalent to
Month 5
2nd Trimester
🥕
Baby is the size of a
Carrot
26.7 cm (~10.5 in) · 360g
🌱Fetal Development Milestones — Week 21
Your baby regularly swallows amniotic fluid, practicing digestive and swallowing reflexes.
Pregnancy timeline progress53%
Week 1Week 21Week 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 21
21 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.
Your baby regularly swallows amniotic fluid, practicing digestive and swallowing reflexes.
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).