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An 8 year study of 253 children found that fetuses exposed to high levels of the male sex hormone testosterone are at a higher risk of developing autistic traits in childhood. These results support earlier animal research linking brain development to fetal levels of the hormone. Autism is a neurodevelopmental disorder characterized by marked deficits in communication and social interaction. Though the data showed a link between fetal testosterone levels and autism, it is not yet clear whether the hormone plays a causal role in the disorder.