Ditch your huge bags.
Children who carry heavy backpacks are at risk for back pain and spinal and shoulder injuries, and the same is true for moms who lug giant purses and diaper bags. Don't carry around more than 10 percent of your body weight (that's 13 pounds if you weigh 130). And your bag should weigh even less than that since you're often carrying your child at the same time, says Brett Taylor, MD, an orthopedic spine specialist at the Orthopedic Center of St. Louis. Take a load off by using a bag with a wide strap (thin straps dig into your shoulders), and switch arms regularly. "Try to find the smallest bag possible," says Dr. Taylor. "It forces you to cut down on the amount of stuff you carry."