Studies have shown that the sound of a crying baby is physically impossible for people to ignore. The Lord made us in such a way that we MUST respond when we hear that sound. You know what other sound we MUST respond to? The sound our cell phone makes when we have a new text message or the notification sound when someone posts about us on Facebook. You're lying if you don't admit that when your phone goes "ding" ( or "boink" or "gong" or whatever your phone does to get your attention) you jump and run to see who it is and what they want.