A roundup of this week’s pregnancy-related scientific research and news:

A growing number of pregnant and nursing women in the U.S. have iodine deficiencies, according to a group of experts who wrote an opinion paper published Tuesday in the Journal of the American Medical Association calling for potassium iodide to be included in all prenatal vitamins.

Iodine deficiency causes low thyroid hormone levels in mothers and can lead to brain development disorders in babies.