Your wife was hemorrhaging when she was brought in. The premature delivery was most likely caused by straining or overwork, and the sudden loss of blood has caused her to slip into a coma.
11 seconds sound clip from the Rocky II movie soundboard.
You can hear this line at 01:14:24.177 in the Blu-ray version of the movie.
Quote context
[...]
- Hey, Rock, they want you across the street.
- Mr. Balboa? I'm Dr. Cooper. The baby is fine, even though it's a month premature.
- Holy smoke. I didn't know she could do it.
- Yeah, well, how is Adrian? Where is Adrian?
- Adrian, it's me. They said outside you're very sick, but I... I don't want to believe that.
- Rocky, come on. You're not doing any good here.
- Let's go see the kid. Adrian would want it.
- No. We gotta see him together. It's okay. We gotta see him together.
- Mr. Balboa, visiting hours are over.
[...]