传统上来说，只有而攻表现出语言迟缓或异常的重复行为时医生才会考虑自闭症的可能性。

Doctors traditionally consider the possibility of autism only if a child shows delayed speech or unusually repetitive behaviors.

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因为语言迟缓是自闭症的一种标志，因此拉斯维加斯加州大学的研究人员研究了儿童开始说话的年纪。

Because speech delays are a hallmark of autism, researchers at the University of California, Los Angeles, studied the age when a child first speaks.

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但是，新的研究还发现没有患有自闭症的20%兄妹们在孩童时，曾经被诊断为语言迟缓或言语问题。

But the new study also found that 20 percent of siblings who did not have autism had been diagnosed with language delay or speech problems early in life.

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