21 Weeks Pregnant
At 21 weeks pregnant, your baby is about the size of a banana.
- Length
- 25 cm (9.8 in)
- Weight
- 300 g (11 oz)
- Trimester
- Second
- Month
- Month 5
- Weeks to go
- 19
Size of a banana
Your baby at 21 weeks
About as long as a banana, your baby has fully formed eyebrows and eyelids. Movements are becoming more coordinated, and you may start to notice a pattern of active and quiet times.
Your body at 21 weeks
Varicose veins, spider veins and swelling can appear as your blood volume and the weight of your uterus increase.
Common symptoms at 21 weeks pregnant
- Stronger kicks
- Varicose veins
- Increased vaginal discharge
- Stretch marks
Every pregnancy is different. Having none of these symptoms is normal too.
Tips for week 21
- Avoid standing or sitting still for long periods, and try compression socks.
- Keep exercising at a level where you can still hold a conversation.
- Start thinking about your birth preferences.
Your week 21 checklist
- Try compression socks
- Keep up moderate exercise
- Start thinking about birth preferences
Helpful at 21 weeks
21 Weeks Pregnant: your questions answered
How big is a baby at 21 weeks pregnant?
At 21 weeks your baby is about the size of a banana: around 25 cm (9.8 in) long and weighing about 300 g (11 oz). Every baby grows at their own pace.
How many months is 21 weeks pregnant?
21 weeks pregnant is month 5 of your pregnancy, in the second trimester. Your due date is 19 weeks away.
How often should my baby move at 21 weeks?
Movements are still irregular at this stage, and you may not feel them every day. A regular pattern usually develops later. Daily kick counting is usually started around 28 weeks.
Sources
This guide is written from public guidance by the American College of Obstetricians and Gynecologists (ACOG), the NHS, the CDC and the World Health Organization. Baby sizes are averages; your baby may be bigger or smaller and still perfectly healthy.
General information only, not medical advice.
History of updates
- : Added a weekly checklist and common questions.
- : Matched fruit, length and weight to the Prego app.
- : Published.