Hypothyroidism is a common endocrine disorder in which your child’s thyroid gland does not produce enough thyroid hormone. A child with an underactive thyroid may experience fatigue, weight gain, constipation, decreased growth, and a host of other issues.

Your child’s thyroid is a small, butterfly-shaped gland in the front of the neck, just below the thyroid cartilage (Adam’s apple). Hormones produced by the thyroid affect all aspects of your child’s health including heart rate, energy metabolism (how effectively the body uses calories), growth and development.