When you put sunscreen on your skin, a chemical called oxybenzone can get into your bloodstream, and some lab and small human studies suggest it might mess with your hormones, affect baby weight...

Most studies say that using sunscreen with oxybenzone while pregnant doesn’t seem to harm the baby’s growth, brain development, or when they hit puberty—but one study found baby boys might be a bit heavier, and another linked it to a rare bowel condition.