The data listed each day of the year with a ranking for how many babies were born on each date from 1973 to 1999. Some interesting trends are evident in the data. Apparently, people like to make babies around the winter holiday season because a large proportion of babies are born in September (ours is due Sept. 24, btw).
Sept. 16 was most common. Feb. 29* was least common.
(via the daily viz)