The giant panda cub born to Lun Lun on November 3, 2010, has been determined to be male. The cub’s sex was determined during an exam by the Zoo Atlanta Veterinary Team and a colleague from the Chengdu Research Base of Giant Panda Breeding.
The Veterinary Team began conducting routine exams late last week, when Lun Lun began leaving the cub for brief periods to eat and drink. The newborn, who weighs just over 11 ounces, has also begun to develop his species’ trademark coloration of black saddles on the shoulders and black patches over the eyes, although his eyes are not yet open.
Source: http://www.zooatlanta.org/home/article_content/its_a_boy