What health problems are prematurely born children more likely to have?

Undeveloped lungs seem to be the main problem. I think some also have slight heart murmurs as well. My granddaughter was premature and her parents were told to keep her out of daycare or any other situation where she might be exposed to large groups of people until she was at least 18 months old. She's a healthy 3 year old now and you would never know she was a premie.What health problems are prematurely born children more likely to have?Pneumonia and other lung problems.