Keepers had an opportunity to weigh the 4.5 week-old giant panda cub on Sept. 21. Smithsonian's National Zoo hide caption
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Giant panda Jia Jia eats bamboo next to her birthday cake made with ice and vegetables at Ocean Park in Hong Kong, on Tuesday. Kin Cheung/AP hide caption
Bao Bao enjoyed her first snow day at the National Zoo, sliding down a hill and playing with her mother. Devin Murphy/Smithsonian's National Zoo hide caption
You can help select a name for the National Zoo's new panda cub. Abby Wood/Smithsonian's National Zoo hide caption
The panda cub now weighs 5 pounds. This photo was taken Tuesday. Courtney Janney/Smithsonian's National Zoo hide caption
The Smithsonian National Zoo's newest giant panda on Aug. 25, two days after her birth. National Zoo/UPI/Landov hide caption
In this image from video provided by the Smithsonian National Zoo, Mei Xiang gives birth to a cub two hours after her water broke Friday. A second cub born Saturday was stillborn. AP hide caption
Lun Lun's twins were born at Zoo Atlanta on Monday night. Adam K. Thompson/Zoo Atlanta hide caption
The giant panda Lin Ping, a star in Thailand whose mandatory trip to China was due at the end of May, can spend up to 15 years in Thailand, under a deal announced this week. The 43-day-old Lin Ping was held by her mother, Lin Hui, in this 2009 photo. Wichai Taprieu/AP hide caption
Sean Connery during the making of the James Bond film "Never Say Never Again." AFP/Getty Images hide caption
Panda cub Xiao Liwu was eager to play with a plastic ball during an exam last month. He made his public debut at the San Diego Zoo on Thursday. Ken Bohn/San Diego Zoo/AP hide caption
Mei Xiang at the National Zoo earlier today. Her cub died last month. Rod Lamkey Jr. /The Washington Times /Landov hide caption
Dennis Kelly (right), director of the Smithsonian's National Zoo, and Suzan Murray, chief veterinarian, discuss the panda cub's death. Mark Wilson/Getty Images hide caption