In children under age two, four postnatal risk factors (acetaminophen use, antibiotic use, ear infections and early weaning) were associated with an increased risk of autism.
Acetaminophen, antibiotics, ear infection, breastfeeding, vitamin D drops, and autism: an epidemiological study
Bittker SS, Bell KR. Neuropsychiatric Disease and Treatment. 2018;14:1399-1414.
This study suggests that increased use of acetaminophen and antibiotics in children under age two, along with an increased incidence of ear infections in the first two years and early weaning, are associated with an increased risk of autism spectrum disorder (ASD). The researchers conducted a large parent Internet survey covering over 1,500 three- to twelve-year-old children who either had or did not have ASD. The findings replicate other studies focused on these postnatal ASD risk factors.