Two Georgia teenagers have pleaded not guilty to murdering a baby who was shot in the face during what authorities described as an attempted street robbery.

Court records show both 17-year-old De'Marquise Elkins and 15-year-old Dominique Lang entered their pleas in writing and waived arraignment before a judge that was scheduled for Thursday morning in Brunswick.

The teens are charged in the March 21 slaying of 13-month-old Antonio Santiago. Authorities say Elkins shot the child in his stroller as he and Lang tried to rob the baby's mother.

Both teenagers have been charged as adults.

Meanwhile, Elkins' aunt, 33-year-old Katrina Elkins, who's accused of providing a false alibi for the 17-year-old, remains in jail in Henry County on an unrelated warrant. She was scheduled to be arraigned Thursday on a charge of giving false statements to police but was not in court. Her attorney said she's been in Henry County since her arrest last month.

After Antonio Santiago (pictured, below) was shot and killed, Katrina Elkins said her nephew could not be the killer because he was with her at her house for breakfast that morning and then ran errands with her family.

On the same day, the teen's mother, Karimah Elkins, was also arrested on a charge of lying to police.

Investigators say after their arrests, the two women gave police information that lead them to a small saltwater pond.

Divers found a handgun in the pond, which is believed to be the weapon used to kill Santiago, but that's pending confirmation until testing is complete at the state crime lab.

Both women posted bond on their charges.

Karimah and Sabrina Elkins, the sister of the 17-year-old, were also pre-arraigned.

Later Thursday, Kevin Gough, the public defender for De'Marquise Elkins, filed a motion for a change of venue, asking the court to consider moving the trial to another county. He is worried that the jury in Glynn County would be too biased in a trial. He cites the manhunt in a nice neighborhood, Santiago's parents' tearful testimony, and the national publicity.