Until it starts producing on its own, the fetus is largely dependent on the mother for the supply of several substances, including thyroid hormones. The thyroid hormones include TSH (thyroid stimulating hormone), T3, and T4/FT4. (FT4 is free T4, which is not bound to protein). TSH is produced in the
Read MoreExclusive breastfeeding during the first six months of life is universally recommended, but some critics of this practice claim that many breastfed children, especially in developing countries, suffer from vitamin D deficiency