My Mum had my sister 6 weeks premmie. Mum had just gone on maternity leave and my sister was born the next day. She had to stay in the neo natal ward in one of those humidicribs for about 2 weeks after being born. My sister came home from hospital on the day of my mums 21st birthday! What a nice pressie!! She was small at birth - 5 pound something, but it didnt affect her (no abnormalities or anything) as she has been totally healthy.