Being a father myself, and speaking from experience, after having your own baby, you will never hear a baby scream in the supermarket the same way ever again. At this point in your lives, you probably think, "Will somebody shut that kid up?!" After caring for and loving a baby of your own, when you hear a baby cry, it triggers something in you. It's almost painful to hear. A baby cry sows a seed of tension in your mind and you want to do whatever it takes, feed it, hold it, burp it, to make the baby happy and stop the crying. It's hard to explain, I guess. Instinct kicks in.