When Caroline gets carried away with the thought that she may be pregnant with Charles' first son, she soon discovers that her childbearing days are through. The anguish this brings causes her to briefly pretend that she is, in fact, pregnant.
I found this episode to be out of character for Caroline. Yes, I acknowledge that there have been several times when she has become unhinged, but I expressed disapproval at those, precisely because I have always seen Caroline as a rock; the family's backbone. It is normal to have disappointment and angst about ending one's childbearing years, however, the extent of the whole affair seemed a bit much, IMO. I did appreciate the anguish that she showed when having to be around Nellie's babies. Was anyone else not happy with Charles' lying to make Caroline feel better?
Another highlight of this episode is the announcement by Laura that she is pregnant! There were two sweet scenes: when Doc Baker tells her and they embrace (knowing that he's been her doctor since she was little) and when she tells Almonzo and her parents.