 Why do they need an incubator?
Once every two hours, the artificial satellite looped completely around the planet, watching what went on below. 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. "Something wrong, doctor?" "Incubator," he said, without taking his eyes off the clock. "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.
 The baby is two months early.
 The baby is one month early.  The baby is three months early.  The baby is two months early.  The baby is four months early.