The family says police told them Brailynn died from 'Shaken Baby Syndrome', which caused her brain to swell ultimately killing her.
The arrest warrant for her father, 21-year-old Anthony Ford, suggests he was the baby's lone caregiver on the day she was injured, and she had been crying more than normal, because she was cutting teeth.
By the time the baby arrived at the hospital that afternoon, she had fresh bruises around her head, neck and chest and no longer showed any signs of brain activity.
According to court documents, Ford had faced Attempted First Degree Murder and Assault charges in a previous case when he was just 15 years old.
The 21-year-old father of a Baltimore 5-month-old is in custody in the infant's death, Baltimore Police said.
Anthony Ford was arrested Thursday. He was charged with second-degree murder, child abuse resulting in death, first- and second-degree child abuse, and first and second-degree assault.
"I have trusted him with my kids. That's what hurts just as much. I have let him be around my 14-year-old, my two boys and I have another daughter that's nine and he watched his own child," explained Damon Wilson, the grandfather of baby Brailynn.
Due to signs of trauma, the death of 5-month-old Brailynn Ford was ruled a homicide.
"I couldn't even go in the room and look at her, but the pictures I saw of her---the first indication to me was somebody hurt this child," said Wilson.
"I'm going to make sure my baby gets justice if it's the last thing I do. I'm going to make sure whoever put their hands on her, they never put their hands on nobody else," added Davetta Parker, Brailynn's great-grandmother.
Officers were called to an area hospital for a report of the injured infant at 3 p.m. on Oct. 4. Police found the baby girl with signs of trauma being cared for by doctors. She succumbed to her injuries and was pronounced dead on Oct. 7. Her body was taken to the Medical Examiner's office, where the homicide ruling was made.