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D Like the mountain gorilla and the hawksbill turtle(玳瑁海 )the American middle child is now an endangered species. Today,nearly two-thirds of women have only one child or two children.Middle children,the largest number of children throughout most of history,will soon be the tiniest. According to studies,middles traditionally receive less financial and emotional support from their parents.They also typically have less close relationships with their mothers and fathers compared with other siblings(兄弟姐妹)，so they tend to have i more friends.Birth-order theory suggests that,because they aren't burdened by too much expectation (like the firstborn) nor too much attention (like the last-born),middle-borns s are