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This includes treatments such as hormonal contraceptives and intrauterine delivery systems.

That white shedding, the researchers wrote, was likely “intrauterine substances still adhered to its body,” according to the paper published in Environmental Biology of Fishes.

Though female great whites give live birth, mothers can nourish pups in utero with a "milk" secreted for the pups — and Sternes believes what the duo saw "was the baby shedding the intrauterine milk."

"I believe what we saw was the baby shedding the intrauterine milk," Sternes said.

The team found that maternal stress during preconception was associated with higher blood glucose levels, especially among women using intrauterine insemination to conceive and women of higher socioeconomic status.