Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) congenital hypothyroidism ?
    ### Response:
    Congenital hypothyroidism is a partial or complete loss of function of the thyroid gland (hypothyroidism) that affects infants from birth (congenital). The thyroid gland is a butterfly-shaped tissue in the lower neck. It makes iodine-containing hormones that play an important role in regulating growth, brain development, and the rate of chemical reactions in the body (metabolism).
    