The second most common birth month is July, with 7,500,795 births and September in third place with 7,411,299. It’s worth noting, though, that both July and August have 31 days in the month ...

The CDC data shows that July, August, September and October tend to be the most popular birth months in the United States, making the colder, cozier winter months the most popular time to conceive.

"The risk related to birth month is relatively minor when compared ... For example, the study authors found that asthma risk is greatest for July and October babies. An earlier Danish study ...