Bones are the scaffolding of the human body and strong bones are necessary for a healthy life. Bone health requires not only normal bone development, morphology and function, but also normal bone nutrition, bone metabolism and bone volume. Bone health in children is defined as the ability of bone to develop morphologically, metabolize nutritionally, and metabolize bone normally from fetal to adolescent age, as well as the ability of bone to perform normal physiological functions and resist bone diseases. From the fertilized egg to the formation of the embryo, and then gradually develop into a fetus, and then transition to childhood and adolescence, are a continuous process of individual development and maturation, this process, no matter which link is affected, will correspondingly affect the future development of bone condition. Calcium is the most abundant mineral in the human body, full-term newborns contain 28-30 g of calcium, accounting for about 1% of body weight, adults contain 1,000-1,200 g of calcium, accounting for about 1.5%-2.0% of body weight, of which 99% exists in bones and teeth, constituting the human scaffold and calcium storage. The turnover of tooth enamel is slow, but the bone is in constant absorption and re-formation, and the rate of renewal is age-dependent, with an annual conversion rate of 100% for infants less than 1 year old, gradually slowing down thereafter, with an annual conversion rate of only 10% in early childhood, to the point where bone growth has stopped in adulthood, with a conversion rate of only 2% to 4% per year, and remains in balance, with the previous relative balance gradually shifting to a negative balance with bone resorption taking precedence from about 40 years of age. From about 40 years of age, the previous relative balance gradually shifts to a negative balance in which bone resorption is the dominant factor. Human calcium nutrition is not only related to rickets in infants and children, osteomalacia and osteoporosis in adults, but also related to the occurrence of hypertension and hyperemesis, and has been widely emphasized, and calcium nutrition in children is of paramount importance. The majority of human bone development occurs in children and adolescents, and the critical period of bone growth is brief. Proper nutrition and lifestyle can contribute to bone development, while inadequate nutrition, obesity, and lack of and inappropriate exercise can have a negative impact on bone development. Children with calcium deficiency often show increased neuroexcitability, irritability, irritability, sleep disturbance, night terrors, excessive sweating, square skull, etc. In severe cases, X- and O-leggedness, corpus cavernosum, exostosis, late closure of fontanelle, delayed teething, unstable walking, growing pains, growth retardation, and immune deficiency. Domestic and international literature reports that the factors influencing calcium nutrition in children include genetics, infectious and nutritional diseases, diet structure, outdoor activities, physical activity and sunlight duration. The height and weight of children with congenital heart disease (hereafter referred to as congenital heart disease) are often lower than those of healthy children of the same age, and the growth and development of infants and children are directly related to nutritional supply, and insufficient nutritional supply is the main reason for the lagging growth and development of congenital heart disease. The earlier the onset of the disease, the more severe the disease is, the more difficult it is to feed the child, and the food intake is limited; in addition, the hemodynamic changes lead to cardiac insufficiency, venous stasis, and intestinal dysfunction, resulting in impaired digestion and absorption, resulting in malnutrition; coupled with increased sympathetic excitability and energy consumption, the limited nutrients are further reduced, affecting growth and development. Because of the congenital malformations and growth retardation of children with precocious heart disease, parents are overprotective and restrict outdoor activities of children with precocious heart disease, with less time in the sun, and because children need adequate calcium intake throughout the developmental period, children with precocious heart disease experience calcium deficiency more frequently than normal healthy children.