Louisville Metro Police say 22-year-old Daira Mejia Aguilar is charged with abuse of a corpse.
A little before 8pm on Saturday local time (10am Sunday AEST), police say they were called to the 700 block of Zorn Avenue in the Brownsboro Zorn neighborhood on the report of a baby in a bag.
When they got there, officers found a bag inside an apartment closet with what they said looked like blood and flies in it.
Aguilar was there as well.
Police say she was read her Miranda rights and gave a statement that she had given birth on Tuesday, July 2 and then wrapped the baby in a blanket and placed it in a trash bag in the closet.
Police say Aguilar then told them she placed her newborn baby in the boot of her car before they got there.
On Sunday, LMPD detectives found the baby wrapped in a blanket in the boot of her vehicle.
Police said the baby appeared to be a full-term newborn. Its gender was not given.
They say the baby's condition as to whether it was stillborn, died during birth, or died after birth is still under an ongoing investigation by coroner.
Aguilar is being held at Louisville Metro Corrections.
She was due to appear in court overnight.
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