Alot of them do survive and thrive. My son was a micro preemie born at 28 weeks. His lowest recorded weight was 1 pound 10 oz. He plays a bunch of sports and is a straight A student. I STILL have the knitted hat that was made for him in the NICU. It is in his memory box with a few other precious items. It was so appreciated. Having a micro preemie is extremely difficult and we (parents) appreciate the hand made gifts for the babies.