A child should be introduced to adult food slowly from the time he weans off the breast or bottle. Please do not make chips and wafers a daily affair. Distract his attention with a book or story telling while you feed him. He will not develop interest in food all of a sudden. You will have to work on it slowly everyday. One food at a time.

My 3 yr old son has same behaviour towards food, there is nothing to worry. What's working with us ? We let him play or do activities, feel hungry inside and come to us for food. Then he even suggests what he wants to eat. Let me know if you have any query.