Most children do not need nutritional supplementation as long as they are provided with foods from the four main food groups (grains, fruits/vegetables, dairy, meat/poultry). Even children 12-24 months old, who tend to be picky eaters, are most likely getting all the vitamins and minerals they need as long as they are given nutritious choices of food. It is preferable to get vitamins and minerals from foods rather than from supplements.
Nutritional needs will vary from child to child, so consult a pediatrician before giving supplements to any infant or young child.
More recommendations coming soon!