The final weeks of pregnancy often feel endless. Remarkably, only about 4% of babies are born precisely on their due date.
Pregnancy is inherently unpredictable, so it's natural to crave some certainty through reliable facts and figures.
How is the due date determined? Due dates are calculated using early ultrasound scans or the first day of your last menstrual period. Even with exact records, accuracy isn't guaranteed—cycles vary, and every pregnancy follows its own rhythm.
When is the chance of giving birth greatest?
Births are spread out widely, making an exact due date elusive. Most deliveries happen between weeks 38 and 42, as obstetricians observe from decades of clinical data.
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