A healthy pregnancy starts long before you actually become pregnant. If you're thinking about having a baby, see your doctor about prenatal nutrition (which often includes taking folic acid supplements), quitting smoking, and other healthy lifestyle changes.

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Mom, 27, Gives Birth to Son While Fighting Breast Cancer: 'I Don't Want People to Feel Sorry for Me'

"I didn't have hope. When you hear the word cancer, it sounds like you're going to die," Kassandra Cerda says.