Myth: Your feet grow a full size when you're pregnant.
Truth: Don't be ridiculous. They normally expand only half a size, says Michele Isaacs Gliksman, M.D., coauthor of The Complete Idiot's Guide to Pregnancy and Childbirth (Alpha Books) and an obstetrician in Fairlawn, New Jersey. With all the additional weight and swelling your tootsies tolerate when you're expecting a baby, it probably shouldn't surprise you that permanent changes are afoot. "Does your stomach look the same as it did before you were pregnant?" Dr. Gliksman asks rhetorically. "Something similar is happening to your feet. Bones, soft tissue, muscles, and blood vessels get so stretched out -- especially if you're having twins -- that they really can't return to their original size." Look on the bright side: major shoe shopping ahead.