Understanding Autism: Autism High-Risk Factors

While autism is not caused by any single factor, research has identified several risk factors that may increase the likelihood of a child being on the spectrum. Understanding these factors can help families seek early evaluation and intervention.

Genetic Factors (strongest evidence)

✓Family history of autism (siblings have a 2–18% recurrence risk; identical twins have 60–90% concordance)
✓Certain genetic conditions associated with autism (Fragile X syndrome, Tuberous Sclerosis, Rett syndrome)
✓Over 100 genes have been identified that may contribute to autism risk
✓Having a parent with broader autism traits (subclinical features)

Prenatal Factors

✓Advanced parental age (both maternal and paternal)
✓Prenatal exposure to certain medications (valproic acid, thalidomide)
✓Gestational diabetes
✓Maternal infections during pregnancy
✓Prenatal stress or complications

Birth & Neonatal Factors

✓Premature birth (before 26 weeks carries highest risk)
✓Very low birth weight
✓Birth complications involving oxygen deprivation
✓Multiple births (twins, triplets)

Environmental Factors (under research)

✓Air pollution exposure during pregnancy
✓Closely spaced pregnancies (less than 1 year apart)
✓Zinc or iron deficiency during pregnancy

Important Notes

Having risk factors does not mean a child will have autism.
Many children with autism have no identified risk factors.
Autism is not caused by vaccines, parenting style, or diet.
Early screening is recommended for ALL children at 18 and 24 months, regardless of risk factors.

What to Do

✓Talk to your pediatrician about developmental screening
✓If your child shows early signs, don't 'wait and see' — early evaluation and intervention lead to the best outcomes

Have concerns about your child?