An online opinion�..
The one thing I didn't like about the ending was that Sarah was the one that had actually killed the child. I'm not quite sure what the scissors had to do with the death, since that was pretty much made out to be suffocation, but I do have to say that I was pretty convinced it was a natural death before that. I had imagined, before that was presented as a possibility, that perhaps the culprit was Aaron, since he was kept marginalized throughout the whole thing. I felt that Sarah should have valued life more, having lost so many children naturally, and with the death of Hannah and the exile of Jacob. I was waiting for someone to explain the bacterial infection from the unpasteurized milk as the reason for Sarah's miscarriages. Katie's sentence was neatly wrapped in a bow, I would have preferred to see what the jury would have said. That said, perhaps it was the just and fit thing for Katie in the end, although she was innocent of the murder.
Whether that helps or not I have no idea!