At the age of four I was diagnosed with hypothyroidism. Around that same time my mother, at age 39, was also diagnosed with hypothyroidism. A few years later she needed to have her thyroid removed. Recently, at the age of 38, my sister was diagnosed with Grave's disease (over-active). We all continued to be treated with mediation. My question is: My daughter is almost 3 and I was wondering the likelihood of her developing a thyroid condition. Is there anything I can do to prevent it from happening to her too?