Port-au-Prince, Haiti -- The screams of wounded Haitians are nearly constant here at a makeshift hospital in the United Nations compound near the airport in Port-au-Prince. Most of the time the screams sound like dull moans. Every so often it's a sudden shriek. But all of them sound agonizing.
We've seen about 250 patients lying here on green cots under tents. Many of them are children. A little boy wearing a tag with the name Sean has been at our side off and on throughout the seven hours we've been in the region. We have a lot of high-tech gear with us, and he seems to like watching us work. Sean looks about 7, and he's on his own tonight. From what we've been told he was orphaned before the earthquake, but he doesn't speak English, so I can't ask him about his parents. His legs are scraped and his head is banged up a bit, but he appears to be one of the more stable patients.
Hospital workers say as best they can tell, Sean's last name is Gonasyom. The boy told the workers he lived with his grandparents when the quake happened. No one knew anything more about them.
Most of the victims here are resting. A few will peer up to look for a doctor or at me. One little girl could only stare up at me with one one wide eye open because her other eye was so badly bruised.
Watch doctors work in the temporary hospital 
CNN traveled to Haiti with doctors from the University of Miami who came to help the wounded and dying in the wake of Tuesday's magnitude 7 earthquake. This temporary hospital lacks even the most basic medical supplies.
CNN Senior Medical Correspondent Elizabeth Cohen contributed to this report.
