First trimester completes at the end of month 3. Baby officially becomes a foetus (week 10). Risk of miscarriage drops significantly. NT scan performed 11-13 weeks.
PREGNANCY MONTH 3 · WEEKS 9–12 · 1st TRIMESTER
BABY AT START OF MONTH
🍇
grape
MONTH
3
of 9 · Weeks 9–12
BABY AT END OF MONTH
🍋
lime
5.4cm · 14g
WEEK-BY-WEEK DEVELOPMENT — MONTH 3 (WK 9–12)
Week 9: Officially a foetus. Eyelids fused. Tongue forming. Muscles moving.
Week 10: Embryonic period ends. Vital organs functional. Fingernails forming.
Week 11: Genitals forming. Baby can open and close fists. Tooth buds present.
Week 12: 1st trimester complete. Reflexes developing. Kidneys producing urine.
🌸 HOW YOU MAY FEEL
Nausea often begins to subside. Risk of miscarriage drops significantly after week 12. Energy starting to return.
COMMON SYMPTOMS — MONTH 3
APPOINTMENTS & TESTS — MONTH 3
NT scan (nuchal translucency) at 11-13 weeks
First trimester blood screening
CVS if indicated (10-13w)
💡 MONTH 3 TIP
The NT scan between 11-13 weeks screens for chromosomal conditions. Combined with blood tests, it gives a risk estimate for Down syndrome and other conditions.
What happens in month 3?
Month 3 (weeks 9-12) — first trimester completion: Week 9: Officially a foetus. Eyelids fused. Muscles moving. Week 10: Embryonic period ends. All organs functional in rudimentary form. Week 11: Genitals forming. Baby can open/close fists. Week 12: 1st trimester complete. Kidneys producing urine. Baby size at end of month 3: lime (~5.4cm, ~14g) Key milestone: NT scan (11-13w) and miscarriage risk drops after week 12.
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Pregnancy month 3 · Weeks 9–12 · 1st trimester · Sources: ACOG, NHS, WHO