Babies born either very small or very large have a higher risk of developing autism, according to the largest ever study into the issue. Researchers found that bigger babies - those born weighing over 9lb 14oz (4.5kg) - showed a higher incidence of autism, as did smaller infants who were born weighing less than 2.5kg or 5lb 5oz. It is the first time that a clear link has been made between babies who grow to above average size at birth and risk of Autism Spectrum Disorder (ASD)
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