Here’s the one where she/Mao Mao gave birth to the cub in this video (female twin named Mao Sun and now lives in Denmark) and the older male twin: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-L66Q_cetA7o.html
毛毛/Mao Mao gave birth to set of twin on 26 July 2014, 毛竹/Mao Zhu, male & 毛笋/Mao Sun, female. The cub in the video was 毛笋/Mao Sun. BTW, at 0:12, 毛毛/Mao Mao seem to be looking around, maybe she sensed her baby through her great sense of smell.
During day time, most of the Pandas are let out into the yard. By evening time, they will be lured back into the indoor cage. I think this is practice by almost all zoo in the world. Regardless of animal. But in this case, Panda mom who have just given birth with cubs which is/are less than 3 months old, it is better for them to be in the cage which is cleaner than in the yard because the cages are clean twice everyday in the morning & afternoon, so that the moms could recover there and also better for the vulnerable cub whereby their immune system is not fully developed. news.cgtn.com/news/3d3d674d774d6a4e77457a6333566d54/share_p.html