Hypothyroidism, short for hypothyroidism, is a disease caused by insufficient synthesis of thyroid hormones or defective receptors. Congenital hypothyroidism in newborns is usually difficult to cure, while temporary hypothyroidism can usually be cured. If the hypothyroidism in newborns is due to an underdeveloped, underdeveloped or ectopic thyroid gland, impaired synthesis of thyroid hormones, or central hypothyroidism, it is usually incurable and requires lifelong use of thyroxine preparations once diagnosed. If the newborn baby is temporary hypothyroidism caused by the mother taking antithyroid drugs or the mother has autoimmune disease, it needs to be treated by applying levothyroxine sodium tablets, and usually improves after 3 months. Hypothyroidism in newborn infants should be diagnosed early and treated as early as possible to avoid damage to brain development. It is recommended that once diagnosed with hypothyroidism to go to the hospital in time, under the guidance of the doctor for treatment, so as not to delay the condition.