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Yes, it is possible. In one study, the chance that an identical twin has autism when the other does is 82%. That means that 18% of the identical twins did not have autism. It is much more likely that an identical twin will have autism if the other does than that a fraternal twin or other sibling will, but it does not happen every time.

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15y ago
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15y ago

Families could have one, two, or more children with autism. Many families only have one child with autism, but some do have more.

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Q: Is it possible for only one twin to develop autism?
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It is possible but very reare and only occurs in i in every 500,000 live births.


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