Most babies are made in winter, born on September 16
Matt Stiles has posted the graphic below showing the most common U.S. birth dates using birth date figures from 1973 to 1999.
A quick glance at the graphic reveals that most babies are made in the winter months of November, December and January based on when the majority of children are born.
The data also shows September 16 was most common birth date and February 29 was least common.
My first child is due on September 16, exactly 4 months from today.