Pregnancy Month 9 (Weeks 33–40) — Development, Symptoms & Tips

Month 9 spans weeks 33-40 — the final stretch. Full term at week 37. GBS test at week 36. Baby ready for birth. Due date is at week 40.

PREGNANCY MONTH 9 · WEEKS 33–40 · 3rd TRIMESTER

BABY AT START OF MONTH

🍈

honeydew melon

MONTH

9

of 9 · Weeks 33–40

Wk 3380–100% completeWk 40

BABY AT END OF MONTH

🍉

watermelon

51.8cm · 3.46 kg

WEEK-BY-WEEK DEVELOPMENT — MONTH 9 (WK 33–40)

33

Week 33-34: Lungs and CNS maturing rapidly. Baby likely head-down.

34

Week 35-36: Nearly full term. GBS test at week 36. Lungs almost mature.

35

Week 37: Full term — safe to deliver. All organs mature.

36

Week 38-40: Final preparations. Labour imminent.

🌸 HOW YOU MAY FEEL

Final stretch. Baby dropping lower (lightening). Cervix softening. Labour signs to watch for. Hospital bag must be ready.

COMMON SYMPTOMS — MONTH 9

Pelvic pressure as baby dropsNesting instinctMucus plug lossBraxton Hicks intensifyingCervical changesLightening (breathing easier)

APPOINTMENTS & TESTS — MONTH 9

📋

Weekly check-ups from week 36

📋

Group B Strep test (36w)

📋

Biophysical profiles if overdue

📋

Induction discussion (41-42w)

💡 MONTH 9 TIP

Week 37 is full term — it is now safe for labour to begin. However, 39-40 weeks gives the baby extra time for brain and lung maturation. If labour has not started by 41-42 weeks, induction is typically offered.

← Month 8

ALL 9 MONTHS

Month 1Month 2Month 3Month 4Month 5Month 6Month 7Month 8

FREQUENTLY ASKED QUESTIONS

What happens in month 9?

Month 9 (weeks 33-40) — final month and birth: Weeks 33-34: Lungs and CNS maturing. Most babies head-down. Weeks 35-36: GBS test at week 36. Lungs nearly mature. Week 37: Full term — safe to deliver. All organs mature. Weeks 38-40: Labour imminent. Due date at week 40. Baby size at end of month 9: watermelon (~51.8cm, ~3.5kg) Key milestone: full term at week 37, GBS test at week 36, due date at week 40.

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Pregnancy month 9 · Weeks 33–40 · 3rd trimester · Sources: ACOG, NHS, WHO