After baby is born

I am planning on going back to work in January, SO is a disabled vet and we are thinking he will stay home and watch the baby while I work. The only thing I'm afraid of is those bad days when he just can't get out of bed. I can't miss work once a week or once ever other week if he doesn't feel ok. Anyone going through something similar? Or have any advice on what we should do? What are your plans after baby is born?