Autism comes from both parents and there are several factors behind this condition. There are genetic reasons for autism as well as environmental causes such as infections, nutritional deficiencies, toxins and stress.
There is no one cause of autism, therefore we can not conclusively say if autism comes from the mother or father. In reality the cause would be a combination of factors.
Infections are very common during pregnancy, and they may lead to autism in the baby. The mothers with diabetes are at higher risk of giving birth to autistic babies. Mothers who smoke during pregnancy also face greater risks of giving birth to autistic children.
Nutritional deficiency is another cause of autism. The mothers should take extra care while eating healthy food during pregnancy. They should avoid drinking alcohol and smoking. This will reduce the chances of giving birth to an autistic child.
Toxins play an important role in causing autism. The pregnant women should avoid consuming any kind of pesticide. They should eat organic food instead of chemical food. They should also consume only safe water while taking a bath
Stress is another reason behind autism. The pregnant mothers should keep themselves calm and relaxed. They should not be worried about anything. They should enjoy their life without worrying about the future.
So, all these factors contribute to autism, but most of the doctors say that there is no single factor behind the disease. Autism is caused by various factors combined.