Abnormalities of thyroid function in newborns are treated using the following approaches. The first step is to apply thyroxine tablets to supplement the replacement therapy, because abnormalities of thyroid function in newborns include both hypothyroidism and hyperthyroidism in newborns. The most common is neonatal hypothyroidism. If the child suffers from hypothyroidism, it will cause slow metabolic rate in the body, mucous oedema, slow heart rate, and affect the child’s intelligence, so it is necessary to supplement thyroxine tablets in time. The second is to inhibit the function of the thyroid gland, if the hyperthyroidism, there will be protruding eyes, fast heart rate and so on, to actively inhibit the child’s thyroid function.