Parents are never happy when their child is ill.
This guide answers these questions and provides suggestions for what to feed the child with diarrhea, vomiting or fever. It is intended to supplement advice from your pediatrician. Although not an expert in PKU, your local pediatrician is an expert in treating common childhood illnesses. To fight fever or infection, the body needs more energy. This extra energy can come from extra food or the body can break down its own protein stores from muscle to make energy.