Infant Nutrition Breast milk is best for your baby and is beneficial even if you only breastfeed for a short amount of time, or part-time. Nutrition for Pre-school Children Preschoolers are eager to learn, especially from other people. They need supervision at mealtime, as they are still working on chewing and swallowing skills. Nutrition for School-age Children School-aged children usually eat four to five times a day, including snacks. Many food habits, likes, and dislikes are established during this time. Nutrition for Adolescents Use the food pyramid as a guideline to help your adolescent eat a healthy diet. It's important that he or she eat a variety of foods while taking in the right amount of calories and fat.