Viability threshold reached at week 24. Baby kicks become strong and regular. Braxton Hicks start. Glucose screening test for gestational diabetes.
PREGNANCY MONTH 6 · WEEKS 21–24 · 2nd TRIMESTER
BABY AT START OF MONTH
🥕
carrot
MONTH
6
of 9 · Weeks 21–24
BABY AT END OF MONTH
🌽
ear of corn
30.0cm · 600g
WEEK-BY-WEEK DEVELOPMENT — MONTH 6 (WK 21–24)
Week 21: Eyebrows and eyelids fully formed. Rapid brain development.
Week 22: Grip reflex developing. Lips more distinct. Sleep cycles established.
Week 23: Hearing more acute — responds to familiar voices. Lungs developing.
Week 24: Viability threshold — could survive with intensive NICU care.
🌸 HOW YOU MAY FEEL
Baby kicks are strong and regular. Braxton Hicks contractions may start. Glucose screening test approaching.
COMMON SYMPTOMS — MONTH 6
APPOINTMENTS & TESTS — MONTH 6
24-week antenatal check
Glucose tolerance test (gestational diabetes screening, 24-28w)
💡 MONTH 6 TIP
Week 24 is a significant milestone — the viability threshold. Before 24 weeks, survival outside the womb is extremely unlikely. At 24 weeks, survival in specialist NICU centres becomes possible.
What happens in month 6?
Month 6 (weeks 21-24) — viability milestone: Week 21: Eyebrows formed. Rapid brain development. Week 22: Grip reflex developing. Sleep cycles established. Week 23: Hearing acute — responds to familiar voices. Week 24: Viability threshold — NICU survival possible. Baby size at end of month 6: ear of corn (~30cm, ~600g) Key milestone: viability threshold at week 24 and glucose screening test.
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Pregnancy month 6 · Weeks 21–24 · 2nd trimester · Sources: ACOG, NHS, WHO