Babies can eat and do not need to fast for micronutrient testing. Micronutrient testing is not routinely performed as part of a pediatric checkup, but it is important to choose whether to do this test or not depending on your baby’s specific situation. Generally, babies under 3 years old are prone to micronutrient deficiencies, especially calcium, iron or zinc. The main clinical manifestations of calcium deficiency are night terrors, excessive sweating, disturbed sleep, and in severe cases, low-calcium convulsions can also occur, while zinc deficient babies tend to have a loss of appetite, food intolerance and slow growth and development. If the lack of iron may occur iron deficiency anemia, pale face, loss of appetite, but also susceptible to other diseases. In short, according to the baby’s situation, if the diet is balanced, everything is normal, and there is no special performance, there is no need to do micronutrient testing.