According to court documents, Jamelle Andrea Peterkin, 23, stuffed a plastic bag in the baby's mouth and covered the child's head with a plastic bag and tied it in a knot on March 13, KPRC in Texas reports.
Broadnax said Peterkin indicated she was angry about the father's new girlfriend.
Broadnax said she notified police, and Peterkin was later arrested and charged with child endangerment.
"The video I sent to the police, she had a plastic bag, she was stuffing it down his throat", Broadnax said. "Officers also saw another still picture of the complainant in a child auto sear with a plastic bag over his head, covering the face and tying it in a knot".
Court documents said Peterkin failed to take the child to a doctor or hospital.
After seeing multiple videos of Jaiden being burned, hit and having a bag placed over his head, she reached out from Virginia to contact authorities in Texas, where the little boy's mother lives.More news: The Walking Dead season 8: Steven Ogg, Pollyanna McIntosh, Katelyn Nacon promoted
"[In] the video I sent to the police, she had a plastic bag".
Peterkin could face up to 10 years in prison if she is convicted.
Harris County Sheriff's Office Child Abuse Unit investigators were asked to take over the case.
Broadnax said her brother, who has three children, had no idea his son was being abused.
She was released on $15,000 bond and must stay at least 200 feet away from her son, a Houston judge ruled.
"She was so nonchalant with an "OK, I don't care" attitude, and she was saying it is her son, and that we did not do anything for the baby", Broadnax said.