Generally, the easy smoothie recipes for kids tend to be ones that are both easy to assemble, and also use ingredients that are fresh and available year-round. Generally you want to stick with fruits that are commonly found in any supermarket. Some of the most common fruits being either fruits like apples, grapes, bananas, strawberries, blueberries, and many of the other varieties that are out there. You can also use other ingredients like yogurt or milk for example, which tends to add a lot more protein, and can also increase the thickness and consistency of your smoothie as well, which many children find to be much more pleasing in terms of taste. You can also add in a few extra and easily obtainable ingredients to make it even more healthy like pouring in a little bit of flaxseed oil for omega-3 fatty acids, or simply adding some fiber powder for increased fiber intake.