Vitamin D is a special vitamin that helps our bodies stay healthy. Our bodies make vitamin D when they are exposed to sunlight. This vitamin helps us absorb calcium, which is important in building strong bones and teeth. Vitamin D also helps prevent sickness. If your body doesn't get enough sunlight it might not make enough vitamin D, so you need to make sure you get enough from the foods that you eat. Milk and some kinds of fish like salmon and mackerel are great sources of vitamin D. Eating these kinds of foods can help make sure you get enough vitamin D!