A keeper takes care of the newborn twin panda cubs. (Photo/Chengdu Research Base of Giant Panda Breeding)

Chengdu in Southwest China's Sichuan province recently witnessed the birth of the world's heaviest twin panda cubs.

Female giant panda Abao, who was born in the US in 2010 and returned to China in 2013, gave birth to the twins - male and female - on Saturday, according to the Chengdu Research Base of Giant Panda Breeding.

The newborns are the world's heaviest captive-bred twin panda cubs on record. (Photo/Chengdu Research Base of Giant Panda Breeding)

The larger cub, born first with a birth weight of 211.6 grams, is male, while the smaller cub is female, weighing 209 grams. The pair represents the world's heaviest captive-bred twin panda cubs on record so far.

The mother and twins are in stable condition, according to the base.

Giant panda Abao takes care of her newborn cub. (Photo/Chengdu Research Base of Giant Panda Breeding)