My daughter was born at 35 weeks and she stayed in the hospital for two weeks. When she was born she could not eat, keep weight on or keep a stable body temp. It was rough at first but even by a week later she was doing much better. She had to stay so long because she kept dropping weight. She had an IV at first, then tube feedings, and then a preemie bottle. She was 5 lbs and 13oz at birth and left the hospital at barely 5 lbs. She also had really bad acid reflux as well but that went away.