A male cub, weighing 179 grams, and a female cub, weighing 89.4 grams, were born yesterday, panda expert Wu Kongju at the Chengdu base said today, adding the cubs were in good health.
Yaxing- who will turn 14 in two weeks- appeared to be at ease with her newborn cubs than first-time mother pandas. She managed to hold the duo after they were born.
Yaxing had also given birth to twins in 2014.
The base celebrated the births of this year's first panda twins on June 20 when Yali delivered two female cubs.