 Before you know it, she talks. Before you know it, she walks. Before you know it, she knows you. Before you know it, she has a heart. Before you know you're pregnant, when your baby's no bigger than a grain of rice. Before she's a twinkle in your eye, that's when you need to take folic acid every day. After that, it's too late to prevent some serious birth defects. Folic acid now. Before you know it.