Thats how I felt. He was ribbing her after a violent c-cection... I think most people were still dumbfounded by how well she took the whole thing, and missed it.
What felt off in the film to me was less the scripting than it was the editing, or at least that's what it seems like on the surface. I'd like to read the script and see what's in there that didn't make the final cut.
There are some strange lapses in character reactions and event sequencing especially in the second half that seem to come down mostly to how the film was stitched together than anything else.
The script has its share of problems but I wonder how many of the issues people have brought up boil down mostly to the editing. A lot of people are leveling certain criticisms at the script when some of those could very well be due to cuts that were made.