Going Past Your Due Date (Late-Term & Post-Term) — Evidence Library

What it is

Only about 4% of babies are born on the exact due date. "Late-term" is 41w0d–41w6d; "post-term" is 42w0d and beyond. Stillbirth risk stays very low but rises slowly week by week after 40 weeks — from roughly 0.5 per 1,000 at 40 weeks to about 1–2 per 1,000 by 42 weeks. Cesarean risk, meconium, and macrosomia (bigger baby) also rise modestly. Most guidelines recommend offering induction between 41w0d and 42w0d, with twice-weekly monitoring (non-stress test + amniotic fluid check) in the meantime if you wait.

Evidence review links

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Possible benefits

Waiting for spontaneous labor works about 70% of the time in the 41st week and avoids induction interventionsReview sources ↓
Twice-weekly monitoring catches most problems earlyReview sources ↓
Induction at 41 weeks reduces stillbirth risk and, in some trials, cesarean risk vs. waiting to 42 weeksReview sources ↓

Possible risks

Stillbirth risk rises each week past 40, especially past 41Review sources ↓
Higher rates of meconium-stained fluid, macrosomia, and shoulder dystociaReview sources ↓
Waiting past 42 weeks: monitoring is less protective and most guidelines advise against itReview sources ↓
Induction of an unfavorable cervix at 41+ weeks can still be a long processReview sources ↓

Alternatives

Immediate induction at 41w0d (many hospitals' default)Review sources ↓
Expectant management with twice-weekly monitoring until 41w6d or 42w0dReview sources ↓
Membrane sweep starting at 39–40 weeks to try to trigger spontaneous laborReview sources ↓

Current evidence

ACOG Committee Opinion 831 (2021) recommends offering induction at 41w0d and advising delivery by 42w6d. A 2019 Cochrane review found induction at or beyond 41 weeks reduced perinatal death compared with expectant management. The SWEPIS trial (Sweden, 2019) was stopped early after more stillbirths in the expectant-management-to-42-weeks arm. WHO recommends induction by 41 weeks in low-risk pregnancies.

Where the evidence is clear · where people may choose differently

For most topics, guidelines from ACOG, WHO, and other major bodies broadly agree on the core safety points (when to act in an emergency, informed-consent standards, monitoring baselines). Where reasonable people — and even guidelines — differ tends to be around thresholds (when to start or stop something), preferences (comfort, environment, support), and values (how you weigh small risks against benefits). Use the questions below to explore those pieces with your care team.

Educational only. Your care team can help you weigh what applies to your specific situation.