Baby Cum Back Share definition Flag Baby Cum Back is when a baby, typically 3-7 weeks old, starts developing flaky and dry skin on their back. "Why is your baby's back so dry and flaky? Have you checked if he has Baby Cum Back? Baby Cum Back by Quarketh April 21, 2020 0 0 Get merch Get the Baby Cum Back mug. Buy Now — $32.95 See more merch