Pregnancy Week 21 — Baby Development, Size & What to Expect

Week 21 of pregnancy — 2nd trimester. Baby is the size of a carrot 🥕, approximately 26.7cm long and weighing 360g. Eyebrows and eyelids fully formed. Rapid brain development. 52% of the 40-week journey complete, 19 weeks remaining.

PREGNANCY WEEK 212nd TRIMESTER

🥕

carrot

baby is about the size of a carrot

WEEK

21

of 40

LENGTH

26.7cm

crown to rump

WEIGHT

360 g

approximate

Progress52% complete
Wk 12nd Trimester (Weeks 13–26)Wk 40

19 weeks remaining · Eyebrows and eyelids fully formed. Rapid brain development.

WEEK 21 — BABY'S DEVELOPMENT

2ND TRIMESTER · Weeks 13–26

Eyebrows and eyelids fully formed. Rapid brain development.

HOW YOU MAY FEEL

Belly button may pop out. Skin stretching. Kicks getting stronger.

WEEK 21 KEY FACTS

Gestational age

Week 21

Trimester

2nd (T2)

Baby length

26.7cm

Baby weight

360 g

Progress

52% complete

Weeks left

19 weeks

FREQUENTLY ASKED QUESTIONS

What happens at week 21 of pregnancy?

At week 21 of pregnancy (2nd trimester):\n\nBaby development: Eyebrows and eyelids fully formed. Rapid brain development.\n\nBaby size: carrot 🥕\nLength: approximately 26.7cm (crown to rump)\nWeight: approximately 360g\n\nPregnancy progress: 52% complete (19 weeks remaining)\n\nGestational age is counted from the first day of your last menstrual period (LMP), not from conception. Week 21 begins on day 141 and ends on day 147 from your LMP.

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Pregnancy week 21 · 2nd trimester · Baby size: carrot 🥕 · 26.7cm · 360 g · Sources: ACOG, WHO fetal growth data