Final answer:
A good snack for a child with PKU could include fresh fruits, oven-baked fries, steamed or roasted vegetables, and some dairy products such as plain fat-free yogurt with fruit, as they are low in phenylalanine.
Step-by-step explanation:
A good snack for a child with phenylketonuria (PKU) needs to be low in phenylalanine, an amino acid that individuals with PKU cannot properly metabolize. Suitable snacks might include fresh fruits like apples or berries, oven-baked fries made from potatoes or sweet potatoes, and steamed or roasted vegetables. Dairy products such as plain fat-free yogurt with fresh fruit or low-fat milk are also good choices. These options help in maintaining a strict diet necessary for managing PKU and avoiding symptoms and damage associated with the disorder.