The first thing we should clarify is that creatine kinase is mainly found in the skeleton, heart muscle, brain tissue and smooth muscle of the human body, and its elevation is generally analyzed from two aspects: the first aspect may be a physiological increase, because the baby is born with malnutrition or lack of nutrition in the mother, so it leads to delayed muscle development and abnormal development of brain tissue, and it is possible to have an increase in creatine kinase during the test. The first aspect may be a physiological increase. The second aspect is the pathological increase, which is commonly seen in infant myocarditis, because the infant’s heart muscle cells are not well developed and are easily infected by external viruses and other factors that cause myocarditis and thus increase creatine kinase, which can be diagnosed and treated early when combined with the child’s symptoms such as cyanosis, developmental delay, and even breathing difficulties.