english: During the first trimester of pregnancy, the fetus is not making its own thyroid hormone, says Thomas Zoeller, director of the Laboratory of Molecular, Cellular and Developmental Endocrinology at the University of Massachusetts Amherst.
non_english: Selama masa kehamilan trimester pertama, janin tidak membuat hormon tiroidnya sendiri, kata Thomas Zoeller, Direktur Laboratorium Molekuler, Sel dan Endokrinologi Perkembangan di University of Massachusetts Amherst.