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"What could cause the higher probabilities of family members being born in the same season? The potential explanations seem to be both social and biological," states Dr. Adela Recio Alcaide, an epidemiologist at the University of Alcala.

The phenomenon likely has its roots in relatives sharing socio-demographic characteristics: people of similar backgrounds are known to pair up and to be more likely to give birth at certain times of the year, say researchers Dr. Adela Recio Alcaide, of the University of Alcalá in Spain, and Professor Luisa N. Borrell, of the City University of New York in the United States.

“If you’re going with a group, make sure that everyone in your group is also fully vaccinated, and try to stay with them,” Alcaide advised.

In Alcaide’s backyard, Rolling Loud — one of the biggest outdoor hip-hop festivals — opened its gates to a sold-out crowd Friday with tens of thousands of fans flooding into Hard Rock Stadium to hear headliners such as A$AP Rocky, Travis Scott and Post Malone.

Alcaide acknowledged big festivals are important for the cities that host them but said it was crucial to take as many precautions as possible.