When your phone's on, carry it some distance from your baby bump.
Studies are ongoing to determine whether the radio frequency energy released by cellphones causes health problems, but until more information is in, it may be smart to take precautions. A recent study found that pregnant women who used cellphones were 54 percent more likely to have children with behavioral problems at age 7. The study authors can’t explain why, though it’s possible that frequent cellphone users pay less attention to their offspring during early childhood. While the researchers say their results shouldn’t alarm pregnant women, it may be prudent to keep the source of the radio frequency energy—the antenna—as far as possible from your body by wearing a headset or earpiece.