Genetics, not diet, is mostly what determines your child's current and future height. There's no single food, drink, or vitamin that will cause your child to sprout and grow taller. That said, although it's rare in children in the U.S., malnutrition can stunt children's growth. To make sure your child is growing at their fullest potential, serve plenty of fruits and vegetables, whole grains, lean proteins, and water instead of sugary drinks.