Any parent knows that you must be wary of leaving your children unattended for too long. After all, siblings love to fight and all it takes is one mishap before you're getting out the first aid kit. Conversely, it's not uncommon for brothers and sisters to get along perfectly - for some time, at least.

When this mother heard noise coming from her newborn's room, she immediately made her way upstairs. But what she found was likely not what she expected: her six-year-old son cradling his newborn baby brother, singing gently to him. Mom knew she had to capture the moment on camera and share it with the world.

Since the minute-long clip was uploaded in December of 2013, it's been viewed more than 7 million times.