U.S. Navy Lt. Thom Miller (left) listens to the heartbeat of a baby girl at the Hun Sen Cheungkor Primary School near Sihanoukville, Cambodia, on Tuesday, July 31, 2012, during a visit to the country by the hospital ship USNS Mercy. (AP Photo/U.S. Navy, Kristopher Radder)

Photo by: KRISTOPHER RADDER

U.S. Navy Lt. Thom Miller (left) listens to the heartbeat of a baby girl at the Hun Sen Cheungkor Primary School near Sihanoukville, Cambodia, on Tuesday, July 31, 2012, during a visit to the country by the hospital ship USNS Mercy. (AP Photo/U.S. Navy, Kristopher Radder)