My daughter was born at 35 and 2 She was almost 6 lbs and completely health she just had a little jaundice but no light therapy and came home with me.
Those babies are usually fine and are in the hospital for at longest a week so they can make sure they know how to eat. My son was a preemie. As far as weight every baby is different if I were to guess I would say around 4 and a half pounds.