While there are some health ailments that most of us will experience in our lives, others are harder to spot because they don't occur very often.
But of course, that doesn't make them any less serious and that goes double when treatment seems impossible because not even doctors know what a patient is suffering from.
So while it's clear that identifying a condition like this is as important as it gets, there are no shortage of rare diseases that require a lifetime of treatment or that remain shrouded in mystery when it comes to everything but their name and symptoms.
With all of that in mind, it's hardly surprising that both health care workers and parents would be vigilant for any problems a new baby might have when they're first experiencing the world.
But as we're about to see, some serious conditions can have such subtle causes and signs that it's easy to understand why they'd slip through the cracks.