Hypothyroid children can perform like a normal child? Hypothyroidism is a condition in which the thyroid gland is underactive and produces an insufficient amount of thyroid hormones. Hypothyroidism is the most common thyroid disorder affecting children. However, children with the disorder display different symptoms from adults. Hypothyroidism in the new born, when left untreated, can lead to intellectual disability and profound developmental delays. What causes hypothyroidism: The most common cause of hypothyroidism is an autoimmune reaction in which the body's immune system slowly destroys the thyroid gland. This is known as Hashimoto's thyroiditis or autoimmune thyroiditis. Maternal antibodies produced against a woman's thyroid, or treatment of a mother's thyroid disorder such as iodine, can affect her unborn child's thyroid function. What are the symptoms of hypothyroidism: The symptoms of hypothyroidism in children are different than in adults...