Week 21 Pregnancy

Second Trimester

You are 21 weeks pregnant and in your second trimester. Your baby is about the size of a pomegranate. This week's key development: Finding a Rhythm. NHS note: Routine midwife appointment to check growth and well-being.

Week 20

Week 22

Baby's Development

Your baby is about the size of a pomegranate.

Finding a Rhythm — Your baby is establishing sleep and wake cycles, and you may start to notice patterns — active in the evenings, quiet in the mornings, or vice versa. Eyebrows and eyelashes are now visible, and the lips are becoming more defined.

Pomegranate

Approx. 26.7cm

Your Symptoms

Varicose veins
Stretch marks
Increased appetite

Every pregnancy is different. You may experience all, some, or none of these symptoms — and that's completely normal. If anything concerns you, speak to your midwife.

NHS Appointments

Routine midwife appointment to check growth and well-being.

Practical Advice for Week 21

Nutrition

Continue vitamin D daily.
Eat regular, balanced meals to manage your increased appetite.
Include foods rich in vitamin K (broccoli, kale) for blood clotting.
Stay well hydrated — 2 litres of water per day is a good target.

Exercise

Walking remains one of the best forms of exercise throughout pregnancy.
Swimming or aqua aerobics — perfect for supporting your growing body.
If varicose veins are appearing, gentle movement helps circulation.
Avoid prolonged standing — take regular breaks if your job requires it.

Wellbeing

You may notice your baby has sleep and wake patterns — enjoy getting to know them.
Stretch marks are common — they affect most pregnant women and fade significantly.
Your appetite may increase — eat nutritious foods but don't restrict yourself.
If varicose veins are bothering you, support tights can help.

Preparation

Routine midwife check — growth and wellbeing assessment.
Start assembling a shortlist of baby names.
If you're planning a nursery, now is a good time to start (while you have energy).
Consider writing a baby shower guest list if friends are planning one.

Tip of the Week

Keep active with walking or swimming to help with circulation and leg aches.

Week 20

Week 22

Track Your Due Date

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NHS Resources

Find trusted information on financial support, antenatal classes, and local maternity services.

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All Weeks

Browse the complete week-by-week pregnancy guide from conception to birth.

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