Security camera footage of a mother allegedly dropping her baby onto a concrete walkway during an argument has been released to the media.

The 10-month-old baby was taken to hospital but was not seriously injured in the incident at the Palmerston bus exchange in the Northern Territory last May.

The 21-year-old woman, who cannot be identified for legal reasons, has pleaded not guilty to recklessly endangering serious harm and aggravated assault.

The footage shows her holding her son before she suddenly flings her arms out and the baby drops onto the ground.

A tussle then takes place as people nearby try to take the baby from the woman.

The Darwin Magistrates Court has previously heard she had been arguing with her partner before the incident.