The only panda born at a US zoo so far this year was placed in an incubator on Monday for closer monitoring by zookeepers after visitors flocked to watch mother and child on a live video feed at Zoo Atlanta.

Zoo officials said in a release they wanted to more closely watch the tiny, hairless cub - which is the size of a stick of butter - based on the behavior of the cub and its mother, Lun Lun, in the zoo's birthing den.

Zoo spokeswoman Simone Griffin said the video feed has been suspended.