 If your toddler falls in the pool, you think you'll hear this. But what you'll really hear is this. It happens quickly and silently. About 260 children younger than five drown in pools each year. That's about one nursery school class each month. Put a fence around your pool. Place an alarm on doors leading to the pool area. For more pool safety tips, visit the U.S. Consumer Product Safety Commission website at cpsc.com.