Micronutrients are very important for all of us, it is about our health. For babies, all aspects of their body functions are not yet fully developed. At this time, micronutrient supplementation is very important, especially for his development. How to know the micronutrients in the baby’s body, it is necessary to inquire through some medical technology, there are three main types. The first one is to use the blood from the fingertips for testing. Fingertip blood is closer to the average micronutrient content of the whole body blood than other parts of the blood, and it is a kind of peripheral blood. Secondly, the test is performed by taking blood from a vein. This method is the closest to the real level, it has very little interference, and is more accurate than the other two. The third, using hair for testing. This is to take a baby’s hair for testing, testing the content of trace elements. But this method is relatively inaccurate, because the child’s metabolism is very fast. These are the three methods of testing. Each method has its shortcomings, so you can make a suitable choice according to the doctor’s advice.