The Problem of Natural Evil

I frequently think of the problem of evil when I'm in the hospital. About two months ago, I saw a 4-year-old girl needing a heart transplant who was attached to shelves of machines. About one month ago, I saw an infant who was born with part of his internal organs outside of his body. These are common occurrences in the NICU and PICU.

It seems hard to me to justify the existence of natural evil with the existence of something like the Christian God. I understand natural evil to be the suffering caused by things such as natural disasters and natural diseases. One defense I've heard is to attribute natural evil to the wrongful exercise of Adam and Eve's free will. My immediate response is the following question: When was that supposed to have happened? The dinosaurs were wiped out by an asteroid, so did Adam and Eve eat the fruit before the dinosaurs went extinct? That can't be the case, because Adam and Eve were supposed to be the first human beings, and there weren't human beings that long ago.

I understand that not all Christians have a literal interpretation of Adam and Eve, but this problem isn't only faced by a literal interpretation. Original sin is human, so it had to have taken place at a point in time. Moreover, it's obvious that there was natural evil before humans existed. So what justifies the existence of prehuman natural evil? This is a problem even if we assume that natural evil allows for the attainment of higher-order goods.