TSH has seasonal fluctuation,higher in fall and w inter than in spring and summer,but there was no significant difference between male and female,and among different ways of childbirth.

• 结果表明：新生儿TSH水平随着食用碘盐时间的延长而降低；秋冬明显高于春夏；不同性别和不同产式间均无显著性差异。