Problem:
I have read about Rhesus D Hemolytic Disease of the Newborn, sometimes called "Rh disease". It's rare, but it can happen when an Rh+ baby is conceived by an Rh- mother.
Required:
Question 1: I have heard this problem only happens with humans; if so, why doesn't it affect other mammals like Rhesus monkeys?
Question 2: Where along the evolutionary time-line did Rh disease come about in the first place?
Could someone explain this to me?