For 57 years, the world’s most famous doll has been stick-thin, setting an ­unrealistic—and, studies show, ­damaging—beauty standard for generations of young women. That all changed in January when Mattel, faced with slumping sales, decided to make Barbie look more like the girls who play with her. Although the original doll still exists, she now has three additional body types (petite, tall and ­curvy)—a shift that has boosted global sales of the Barbie Fashionista brand by 44%. Of course, society is still a long way from solving its body-image issues; that’s “a heavy burden for [Barbie’s] tiny shoulders,” says Robert Best, a Barbie designer. But the new shapes, along with the new skin tones and hair textures introduced last year, are undeniably a step in the right direction.