The 20-year-old, who has made two first-team appearances for the Bluebirds, makes the short trip towards the English border to join up with the League Two side.
The Cardiff academy graduate will be included in Newport's squad for Saturday's League Two game at Fleetwood.
"We've had to reinforce and Cardiff have helped us," County manager Justin Edinburgh told the BBC.
"It was necessary that we did it. We have eight senior players injured at the present time and we're not able to cope with that.
"The board have backed me to bring reinforcements in and we're delighted to have done so."
- Sports & Recreation