Key Findings: Autism is Associated with Amount of Time Between Births
- Children conceived less than 18 months after their mother’s previous birth or children conceived 60 or more months after their mother’s previous birth were more likely to have ASD when compared to children conceived between 18 to 59 months after their mother’s previous birth. The relationship is stronger in children with severe ASD symptoms.
- The linkage between birth spacing (the period of time between pregnancies) and having a child with ASD appeared to be unique to ASD, as there was no linkage found between birth spacing and having children with other developmental disabilities.
- The linkage between birth spacing and having a child with ASD was not explained by unplanned pregnancy, an underlying fertility disorder in the mother, or high blood pressure or diabetes during pregnancy.
About This Study
- Learn more about the number of people who have ASD, and
- Identify factors that may put children at risk for ASD and other developmental disabilities.
For more information, visit https://www.cdc.gov/ncbddd/autism.