However, they cautioned, the study needs to be replicated in more generalizable populations because the only toddlers with autism in the study were at high genetic risk and the majority were white.

Also, sampling bias was likely. Parents reported concerns about 44% of six-month-old infants and 76% of 14-month-olds at study entry.

The researchers said work is under way to develop autism diagnostic tools for children age two and younger who cannot yet speak.

The study was funded by grants from the National Institute of Mental Health. The researchers reported no financial conflicts of interest.
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