Sam heard the wince. His eyes moved to her stomach and the jolted memory that followed caught him by plenty of surprise. He had thought that the baby would have been more far along now. Maybe even born. Taking the timing of how things had been running back in that other world into consideration, it was not exactly the most far out there conclusion one could possibly make. Plus, he had been gone for longer. But then that was probably why he was still so shocked to see Lois lacking in the progression.
...not that he was complaining, exactly. After all that he had done, Sam didn't even want to touch parenthood.
"Uh, he's my twin zombie or something," Sam said distractedly, tipping his head to the side to get a better look. "Are you okay?"