Originally Posted by Derbylicious
Did she develop this flat affect after having your child? Is there a chance that she could be suffering from post partum depression? It might be worth looking into.
Yes. Was she always like this, or is it recent? She may be suffering from depression of one sort or another, or some other psychological issue. Flat affect is not a normal way to be, and it usually is a symptom of an underlying issue. I would definitely try to get her to see somebody to figure out what's going on (maybe you could do couple's therapy and let the therapist know that you are worried about her affect?).
If for no other reason than your child's well being, please check into this.