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A New Study Has Found That 'Eldest Daughter Syndrome' Is 100% A Real Thing, So Call Your Sister And Let Her Know

A University of California, Los Angeles-led research team found that, in certain instances, first-born daughters tend to mature earlier.

Two children, one with sunglasses, sitting together on a couch

Growing up as the oldest sibling, author Y.L. Wolfe often felt the lines between her role and her mother’s role were blurred. 

“By the time my youngest brother was born when I was almost 11, I was overwhelmed with feelings of responsibility for his welfare. I used to sit by his crib and watch him sleep just to make sure he was safe,” Wolfe, the oldest of four, told HuffPost. 

“It wasn’t that I thought my mother wasn’t competent ― but more that I felt we were both responsible for the family by that point in my life,” she explained. “As if I was literally ‘other mom,’ rather than big sister.”

In other words, Wolf