Detectives charged the grandmother with attempted murder and serious assault yesterday, with police saying the boy's mother was 'distraught'.
Police said the baby's mother was woken to the sound of his cries at about 6.30am Tuesday, and found the baby in his cot with a female family member in the room and of a large knife nearby.
The baby is in hospital in a serious but stable condition after undergoing emergency surgery.
A 64-year-old woman, who is known to the child, is now assisting officers with their inquiries.
She sat motionless as her matter was mentioned.
The woman, who can not be named for legal reasons, was silent and stared down during a brief hearing at the Brisbane Magistrates Court this morning.
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"There's some days needed to allow for some assessments to be conducted", he told the court, confirming outside they were to do with her mental health.
Inspector Daniel Bragg said ambulance and police were "visibly distressed" after responding to a knife attack on a Brisbane baby today.
"This is the worst case scenario", he told reporters just before 10.30am.
"We deal in trauma, we're used to trauma".
Insp. Bragg said paramedics who were called to the home, as well as the first police officer on the scene, were visibly distressed by the scene. "But probably the most affecting job you can go to is one involving a child".