Second trimester
Pregnancy Week 21
Your baby is about the size of a carrot.
Size
carrot
Length
27 cm
Weight
360 g
Baby in week 21
Movements become stronger. Eyebrows and eyelids fully formed.
What you may notice this week
Possible Braxton Hicks (practice contractions). Stretch marks may appear.
Tips for week 21
- Moisturize your belly daily
- Wear comfortable clothing
- Time any contractions to know if they're real
Tools that pair with this week
Due Date Calculator
Estimate your delivery date by last period or conception date. Naegele’s rule plus cycle adjustments.
Week Tracker
See exactly how many weeks and days pregnant you are, plus your trimester and key milestones.
Contraction Timer
Tap once to start, once to stop. Tracks duration, frequency, and pattern over time.
Ovulation Calculator
Find your fertile window based on your cycle length. Plan or avoid with confidence.
Baby Name Generator
Filter by origin, style, length, and starting letter. Boys, girls, and unisex.
Growth Percentile
Plot your baby’s weight, length, and head circumference against WHO percentile curves.