A child’s brain relies on a mix of nutrients to function properly—especially iron, omega-3 fatty acids, B vitamins, and magnesium. If their diet is low in these essentials, they may struggle with poor concentration, irritability, and even fatigue. A child low in iron, for instance, may appear tired all the time, while a lack of omega-3s can slow cognitive development. Include brain-boosting foods like eggs, leafy greens, nuts, seeds, fatty fish (or plant-based sources like flaxseed), and fruits. If needed, talk to your pediatrician about supplements.