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Pregnancy Duration: When Is Full Term and Why Delivery Dates Vary
Typical Delivery Timing
Most pregnancies reach full term at about 40 weeks from the first day of the last menstrual period (LMP).
Full‑Term Definition
WHO and ACOG define full term as 37–42 weeks. Before 37 weeks = preterm; after 42 weeks = post‑term.
Why Timing Varies
Maternal health, fetal growth, and placental function influence labor onset. Delivery a few days before or after the due date is common and often normal with proper monitoring.
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