It’s not too late for a pregnant woman with low urinary iodine at 16 weeks to get iodine supplementation. Iodine is the main raw material for thyroxine synthesis. And thyroxine is a very important hormone that promotes fetal growth and development, including the development of the nervous system. Iodine deficiency during pregnancy may cause neonatal cretinism, resulting in low intelligence and growth retardation in children. The important period for pregnant women to supplement iodine is within the first 3 months of pregnancy, because iodine supplementation in the early embryonic period can promote intellectual development and prevent cretinism in infants and young children. Pregnant women in pregnancy thyroid function is active, iodine demand increases, easy to lead to insufficient iodine intake during pregnancy, if there is no hypothyroidism does not affect the fetus, do not have to worry about it, you can strengthen the iodine treatment under the guidance of the doctor. Pregnant women can moderately supplement iodine food, such as kelp, nori, fish liver, sea cucumbers, jellyfish, etc., if necessary, you can follow the doctor’s instructions to take iodized oil gelatin pills and other drugs. Pregnant women need scientific and reasonable iodine supplementation, it is recommended that pregnant women consult a nutritionist, nurse or dietitian, choose appropriate foods and supplements, do not blindly supplement iodine, do not blindly self-medication, please follow the doctor’s instructions.