Shaun Oxenreider, 25, and Samantha Trump, 27, were earlier charged in Berks County with concealing the death of a child, abuse of a corpse and conspiracy.
Authorities say Harper Trump's body was found March 20 in a trash bag in a plastic container filled with cat litter at the Springfield Township complex.
An autopsy concluded she died around January 1 from blunt force head trauma and had rib fractures.
The defendants remain in prison in lieu of $250,000 bail each.
Messages left with their legal representatives after business hours Wednesday weren't immediately returned; Oxenreider's attorney earlier said his client wasn't the primary caregiver.
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