A couple who failed to seek medical treatment for their baby daughter, who was severely ill with eczema before an infection killed her, wept in the dock today as they were jailed for her manslaughter.

Thomas Sam, 42, and his wife Manju, 37, were convicted in the NSW Supreme Court over the death of nine-month-old Gloria, with a jury accepting they were guilty of criminal negligence.

Thomas Sam and his wife Manju Sam. Credit:Peter Rae

Sentencing Thomas Sam to a minimum of six years in jail and Manju Sam to at least four, Justice Peter Johnson said Gloria was subjected to significant pain over an extended period and her parents' failure to seek proper help for her amounted to cruelty.

"Gloria suffered helplessly and unnecessarily ... from a condition that was treatable," the judge said.