How Does This Happen?

At first, Louise and Claire thought that it was due to an illness. That is what is assumed at first by most people. When they were relieved that she wasn’t ill, they believed it could be because of some health reasons. You may hold some health condition responsible for the phenomena but that is not the case.

There is actually a very sound and scientific reasoning behind this phenomena. So, what is the reason for the change in the color of this newborn as compared to its brothers and sisters?