When my daughter was 2 years old, many people made comments that they thought she was autistic. Several times every week, she would throw tantrums that literally lasted all day long. Anytimes she was mad or frustrated, she would viciously attack the dog, her brother, or anyone in sight. She was evaluated by the state to be eligible for "special services".
I have done nothing other than improve her diet and give her lots of cilantro/cilantro extract. (Also, I stopped having her vaccinated.)
She is now 3 1/2. She is now a delightful child and people cannot believe it when I tell them that she goes to a special needs school. Even though she is the youngest at her school, her teacher says that she is the most advanced. This coming year she will be spending part of her days in the "normal" preschool. Next year, I will take her out of the special school and put her in a regular preschool.