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A 4-day-old newborn baby lies in a baby bed in the maternity ward of a hospital in a city in the east German state of Brandenburg, Germany.
Birthdays determine a variety of things, such as your horoscope and when you begin formal education.
But more importantly, birthdays might also determine your health as a baby. Economists at Princeton University found that babies conceived around May, and thus born around January and February, have a higher health risk.
The study is published in the latest edition of the Proceedings of the National Academy of Sciences, and one of the economists in the study, Hannes Schwandt, joined the show.