Can 2 rh negatives have an rh positive child?

This post is mainly for the newcomers to the blog as most readers and subscribers probably know the answer.

It is impossible for two true rh negatives to have an rh positive child.
You are rh negative when you test negative for the presence of D. You cannot pass on something if it’s absent.

It is possible however that someone tests as an rh negative, but is in reality a “weak D”, meaning that the D is present, but its expression is so weak, that some blood type tests can show up as being rh negative. Someone who is weak D CAN produce an rh positive child.