Las Vegas Sun - Photograph : Panda Cub Bao Bao In Good Health

December 16, 2017

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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, Aug. 23, 2013, at the National Zoo in Washington. The zoo has been on round-the-clock panda watch since Aug. 7, when Mei Xiang began showing behavioral changes consistent with a pregnancy or pseudopregnancy.

Smithsonian National Zoo / AP

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, Aug. 23, 2013, at the National Zoo in Washington. The zoo has been on round-the-clock panda watch since Aug. 7, when Mei Xiang began showing behavioral changes consistent with a pregnancy or pseudopregnancy.