The mystery surrounding the death of a newborn found in his cheerleader mother's closet has deepened as his autopsy was inconclusive, according to officials.

University of Kentucky student Laken Snelling, 21, was arrested after police found her newborn baby boy inside a trash bag in her closet in her Lexington home.

The Fayette County Coroner's Office said in the baby's autopsy report that it will conduct 'extensive microcosmic analyses' to determine the cause and manner of death.

'I understand the community's concern and sensitivity surrounding the death of a child. This death affects many lives in our neighboring state of Tennessee and as well as those in the Commonwealth.

'We are currently conducting a thorough and methodical death investigation to ensure all facts are carefully considered.'