5mths postpartum, exclusively breastfeeding. how can ppd (postpartum depression) affect ones sex life?

Yes, it can: In fact, it can effect everything and is very worth seeking specialized treatment for. The well-being of your entire family (especially you) is in the balance. It's a common condition w/ elements that come from hormone changes, life demands, emotional intensity of relationships, etc. A good fit w/ an experienced therapist really helps. If meds are needed briefly they'll help select the right one.

Absolutely : If you are depressed then things that are normally pleasurable are'nt.If you find that this is the case with you ,hVe you primary refer you for psychotherapy.