4.5-week-old Bei Bei being weighed (Photo Credit: Smithsonian’s National Zoo)

On January 16, hundreds of panda lovers lined up outside the gates of the National Zoo in Washington D.C. to be the first to get a glimpse at Bei Bei. While the giant panda cub that was born on August 22, 2015 has been visible on the zoo's video camera, this was his first public appearance.