 Why can't they build an incubator?
Once every two hours, the artificial satellite looped completely around the planet, watching what went on below. Why, I wouldn't let you get into an airplane, much less land on Earth in a rocket! The terrible pressure of a rocket landing would increase her effective body weight to nearly half a ton; an adult human being couldn't take that sort of punishment for long, much less the tiny life that was growing within her. "Incubator. We can't deliver a seven-month preemie without an incubator." But as soon as we get within radio range of White Sands, I'll ask them to send up an emergency rocket with an incubator. MEDICS LOADING SHIP TWELVE WITH INCUBATOR AND OTHER SUPPLIES.
 There are no spare parts aboard the space station.
 They don't have the right kind of lights aboard the space station.  It does not occur to them to build an incubator.  None of them no how to build an incubator and the asteroid knocked out communications.  There are no spare parts aboard the space station.