Elevated TSH indicates congenital hypothyroidism in newborns, a decrease in the secretion of thyroid hormones or a deficiency of thyroid hormone, which is an important hormone for human growth and development, and if a child lacks thyroid hormone during growth and development, he or she will suffer from mental retardation, growth retardation and low physiological function, also known as cretinism. This is commonly known as cretinism, which is a serious threat to the child’s health. If TSH is found to be elevated in the screening test, parents must pay more attention to it and review it in a timely manner. Once the diagnosis of congenital hypothyroidism is confirmed, medication should be administered in a timely manner to avoid delaying the growth and development of the child. Of course, a normal TSH screening test does not rule out 100% of diseases, but children with central hypothyroidism and delayed TSH elevation are also normal during the screening test.