(Reuters) Feeding infant girls baby formula containing soy may set them up for more painful menstrual periods as young women, a new study suggests.

The research, which included information on more than 1,500 African American women, reinforces findings in earlier studies that included mostly Caucasian women.

“We observed that soy formula feeding during infancy was associated with several indicators of severe menstrual pain in reproductive age women,” said Kristen Upson, a postdoctoral fellow in the epidemiology branch at the National Institute of Environmental Health Sciences (NIEHS) in Research Triangle Park, North Carolina.

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