When Emily and Seth Peterson welcomed their twin sons, Samuel and Rowan into the world, they noticed something unique about their birth, and so did the rest of the hospital staff.
In fact, it was the first time Cape Cod Hospital maternity nurse, Deb Totten, ever came across it in her 40 years of nursing.
The hospital snapped a photo of the proud couple with their babies and decided to turn this birthing anomaly into a fun riddle for the internet to solve.
I have to admit, I needed to scroll down and take a peek at the answer. Try figuring it out for yourself before seeing if you were right!