Many experts disagree on this question; however, in my experience, if your child is eating a well-balanced diet full of fruits, vegetables, high quality proteins, whole grains, and healthy fats, it's probably unnecessary. However, if your child is deficient or is a really picky eater, maybe doesn't eat any protein, doesn't eat vegetables, you may want to consider supplementing with a children's multivitamin. When choosing a multivitamin for your child, it's important to choose the more natural brands over the synthetic ones. And if you're still not sure, it's best to consult your doctor or nutritionist about what then your child needs to supplements. Keep in mind that some vitamins and minerals may interact with your child medications and may them sick or nauseous. Therefore, it is really important to make you get the right dosage of vitamin for your child, which can be checked with your doctor, and as well that they're not taking megadoses, which can be toxic to your child's health. A megadose just means is too much for your child's body to process. Ideally is best for kids to get most of their vitamins from fresh, healthy foods, including a variety of vegetables and fruits, high quality proteins, whole grains, and healthy fats. Finally, the best way you make sure your child is getting the vitamins and nutrients they need, is to involve them in the preparing and cooking process of whole fresh foods. That way you know you're getting the nutrients they need to lead a healthy balanced life style.