Like Bloody Mary, Baby Blue requires a dark bathroom and a mirror. Players must go into the bathroom alone, turn off all the lights, lock the door, and put their arms out like they are rocking a baby. Repeat "Blue Baby, Baby Blue" 13 times, and you'll start to feel the weight of a baby in your arms. But make sure to turn on the light and get out before the baby's mother comes looking for it by appearing in the mirror!