Angie Steffke's 8-month-old son, Owen, became part of a new and disturbing pattern for infant death when he died in his Indianapolis, Ind., home on Oct. 6, 2003.

Owen, according to records sent to the Centers for Disease Control and Prevention, officially died of "other ill-defined and unspecified causes of mortality" as well as of "coma, unspecified."

Officially, Owen died of a mystery.

"The autopsy report said 'undetermined causes.' It is a horrible, horrible thing to be told that no one knows why my baby died," Steffke said.

"A police detective told me that the state of Indiana no longer uses the term SIDS. The new name is 'undetermined causes,' " Steffke said. "That really upset me because they want to say that SIDS is happening less often. But there are no fewer babies dying. They are just calling it 'undetermined causes."