All those children, as well as all the children today that are suffering with cancer and other diseases, have to die because 6000 years ago a naked lady listened to a talking snake and ate a piece of low-hanging fruit.
Regardless of what "Adam/Eve" did however long ago... no one is forcing anyone else to cause harm to another person, child or not. Disease is another matter (and we know that some of that is caused by us and our decisions), but actions inflicted upon our fellow man by man is completely 100% upon our own heads.
Peace,
tammy