When are babies born?

The monthly birth rate over time, per 1,000 people. Over the decades, it's not a smooth line because each year has an internal peak. The annual timing of each state's peak in number of births correlates with its latitude. More northern regions see a birth peak in June or July while more southern areas have more births in October or November. The pattern holds even as the overall birth rate varies in different states.

Chart: The Conversation, CC-BY-ND Source: National Center for Health Statistics Get the data