(CNN) -- When anything is wrong with your child, your first instinct is to make it better. Diagnose the situation, find the answer to the problem and take your child's pain away. But with autism, that takes quite a lot of doing.
Right after our son Danny celebrated his second birthday, he started to have increasingly lengthy and violent tantrums, usually initiated by his extraordinary sensitivity to sound. At the slightest provocation -- telephone ring, doorbell, a blow dryer, blender -- he would begin to scream, hold his ears and throw himself down on the ground.
We went right to our pediatrician, who was not alarmed, gave him a routine hearing test, and basically said, "He's 2, you've heard of the "terrible 2s."