My child only wants to eat peanut butter sandwiches. What should I do?
Food jags (when children want to eat only a particular food) are common in young children.
Offer smaller servings of the favored food, along with other foods, to ensure that your child eats a variety of foods.
Jags rarely last long enough to be harmful. If your child is energetic and growing, he is probably eating enough.
Source: Bright Futures: Nutrition, 3rd Edition (Copyright © 2011 American Academy of Pediatrics)