Trimester 2
21 Weeks Pregnant
At week 21, your baby is focusing on growth and refining their movements. They are starting to hear the sounds of your heartbeat and voice, and their tiny muscles are getting stronger as they practice kicking and rolling in the womb.
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Your baby is the size of a Carrot
27 cm
Length
360 g
Weight
Week 1Week 13 - End of Trimester 1Week 27Week 42
Baby's Development This Week
At week 21, your baby is focusing on growth and refining their movements. They are starting to hear the sounds of your heartbeat and voice, and their tiny muscles are getting stronger as they practice kicking and rolling in the womb.
- The fetus is swallowing amniotic fluid and absorbing nutrients.
- Bone marrow is now producing blood cells.
- Small intestine begins absorbing sugars.
- Eyebrows and eyelids are fully formed.
- Movement patterns become more defined.
- About 26.7cm — the size of a carrot.
Your Symptoms at Week 21
Week 21 is part of the 'honeymoon phase' of pregnancy. You likely have more energy now and your bump is starting to show. You might notice changes in your hair and skin, and you're probably starting to feel the wonderful sensation of your baby moving.
Braxton Hicks contractions
Change positions and drink water; they should stop. (mild)
Change positions and drink water; they should stop. (mild)
Varicose veins
Elevate legs; wear compression stockings. (mild)
Elevate legs; wear compression stockings. (mild)
Stretch marks
Moisturize; stay hydrated. (mild)
Moisturize; stay hydrated. (mild)
Backache
Prenatal massage, warm baths, and good posture. (moderate)
Prenatal massage, warm baths, and good posture. (moderate)
When to Call Your Doctor
- More than 4 contractions in an hour before 37 weeks
- Contractions that get stronger, longer, and closer together
- Vaginal bleeding
- Fluid leaking from vagina
Week 21 Checklist
- ✓Learn the difference between Braxton Hicks and real contractions (essential)
- ✓Continue moderate exercise — walking and swimming are excellent (recommended)
- ✓Start a baby registry if you haven't (optional)
- ✓Research pediatricians in your area (recommended)
Frequently Asked Questions
Continue Your Pregnancy Journey — Week 21
← →
Week 20 of Pregnancy
Review what happened last week with your baby's development
← →
Week 22 of Pregnancy
What's coming next week — new developments and symptoms to expect
Guide
Second Trimester Overview
Everything happening during your second trimester — symptoms, tests, and milestones
Symptom
Heartburn & Indigestion
Safe remedies and foods to avoid during pregnancy
Symptom
Back Pain in Pregnancy
Exercises, positions, and when back pain is serious
Tool
Kick Counter
Start counting fetal movements — kicks should begin around week 18
Related
Anatomy Scan Ultrasound
The detailed 20-week scan that checks all major organ systems
Nutrition
Second Trimester Nutrition
Iron, calcium, and the best foods for your growing baby
Medical Disclaimer: This content is for informational purposes only and is not a substitute for professional medical advice. Always consult your healthcare provider for personalized guidance about your pregnancy.