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This is caused by a build-up of bilirubin, a yellow substance, in the blood, meaning the babies' skins have a yellow tinge.

That’s because the research team found that bilirubin reductase is present in almost all healthy adults.

For example, scientists have found that bilirubin may steer immune cells called macrophages to curtail their secretion of inflammatory molecules.

But there are diseases that can increase bilirubin levels — either because something happens to block its excretion or because more red blood cells are being broken down, causing more bilirubin to be made.

Her husband took her to an emergency room, where she was told she had heightened levels of bilirubin that could indicate potential issues with her liver or bile duct, and she was severely dehydrated.