There Might Actually Be Some Science Behind Eldest Daughter Syndrome

Is "eldest daughter syndrome" a real thing? A new study gives it credence. 

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...