The most common day for babies to be born in the U.S. is Tuesday, largely due to scheduled births during the workweek.

Data from the National Center for Health Statistics shows a huge difference between weekdays and weekends. In a major study, about 12,587 babies were born every Tuesday, while only 7,370 were born on Sundays. That is a 71% jump in births just because of the day of the week.The main reason for this is how modern medicine works. About 32% of all births in the U.S. are now C-sections, which are surgeries that can be planned in advance. Doctors also use medicine to start labor, which is called induction. These planned events are usually set for times when the full hospital team is available.Tuesday is the 'sweet spot' for many hospitals. It avoids the rush of Monday morning and the wrap-up of the workweek on Friday. Researchers T.J. Mathews and Brady E. Hamilton found that births used to be spread evenly across all seven days before the 1970s. Back then, most babies arrived whenever nature decided.This trend is seen in other countries too, like the U.K. and Australia. In these places, Tuesday and Wednesday are almost always the busiest days for delivery rooms. On the flip side, the fewest babies are born on Christmas Day and other major holidays. This happens because doctors and parents rarely schedule a birth on a day meant for celebration.