What does doctor Gunn say is happening because of the attack?

From the text:

Dan Gunn came out of the bathroom, drying his hands. "You've got more trouble waiting in your room," Randy said. "A woman's having a baby, or about to. Garcia's wife." Dan dropped his towel across the foot of the bed and pulled the ,sheet over the corpse. "Everybody who was going to have a coronary just had one," he said, "and I suppose that every woman who was due to have a baby in the next two months is having one now.