 2. Family history. Having a close family member with ASD significantly increases the risk suggesting a strong genetic component. However, not every individual with a genetic predisposition will develop ASD. 3. Environmental factors, prenatal and early life events. Certain prenatal and early life experiences, such as maternal infections during pregnancy, premature birth, or early exposure to environmental toxins, have been linked to an increased risk of ASD. However, it's crucial to remember that correlation doesn't equal causation, and these factors likely contribute alongside genetic influences. 4. Birth complications. While not every child with ASD experiences birth complications, low birth weight and certain delivery complications may play a role in some cases.