The current work — using data from more than three million children from the United Kingdom and Sweden, including 17,495 who were exposed to antiseizure medications during pregnancy — found that children exposed to the antiseizure drug lamotrigine in utero were at no additional risk for autism or intellectual disability compared with those exposed to other antiseizure medications. However, children exposed to valproate, topiramate, and carbamazepine were linked to specific neurodevelopmental issues.