What is the chance that I go into labor, based on week of pregnancy?
Last updated on June 3, 2026
Most singleton babies are born during the 39th week of pregnancy, with about 70% of births occurring before the due date. If you reach your due date, there’s a 60% chance of giving birth within the next week. First-time mothers are most likely to give birth in the 39th or 40th week. For twins, spontaneous births typically occur around weeks 36 and 37, and few pregnancies go beyond 38 weeks, due to medical considerations.
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