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Older sisters often moan that their younger siblings have all the luck.But it seems they really do have something to complain about—for research has found that younger sisters are more likely to be slimmer than firstborn girls.The study—the largest of its kind—suggests that birth order may play an important role in determining weight.And the researchers
Older sisters often moan that their younger siblings have all the luck.But it seem they really do have something to complain about-for research has found that younger sisters are more likely to be slimmer than firstborn girls.The study-the largest of its kind -suggests that birth order may play an important role in determining weight. And the researchers