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The teen's medical records indicated she was 23 weeks pregnant at the time with a due date of July 3, while prosecutors alleged the newborn was terminated at 30 weeks, according to News Channel Nebraska.
During their investigation, officials also discovered Facebook messages between the mother-daughter duo in which they were discussing abortion pills.
The messages - sent April 20, two days before the alleged stillbirth - revealed that Jessica advised her daughter on how to use the pills.
Celeste reportedly stated that she couldn't wait to get the 'thing' out of her body, adding 'I will finally be able to wear jeans'.
Jessica confirmed they would 'burn the evidence afterward.'
Tanner Barnhill, 22, was also charged with helping the pair dispose of the fetus.
Norfolk police launched an investigation into the Burgess family in April after receiving a tip that Celeste had miscarried and buried the body.
When officials interviewed Celeste, she claimed she had miscarried on April 22 sometime after midnight, according to an affidavit obtained by KMTV.
She told police she told her mother what happened, bagged up the fetus and placed it inside a box in the back of a cargo van.
Jessica and Celeste drove to a property north of Norfolk, allegedly belonging to Barnhill's parents, and buried the body.
The affidavit does not specify when the burial happened, but notes Barnhill helped with the task.