China on Tuesday unveiled the world's first panda triplets, 15 days after their birth, during which time they were kept in incubators. The triplets are the only surviving set so far as panda triplets have an extremely low survival rate at birth, China Daily, a local newspaper reported.

The giant panda Juxiao gave birth to the triplets on July 29 at the Chimelong Safari Park in Guangzhou, the capital of Guangdong province, in southwestern China. The delivery of the three cubs lasted four hours, leaving the mother too exhausted to care for her newborn cubs. The park’s officials moved the cubs to incubators before bringing them back to their mother, the report said.

“After nearly half a month under the care of the mother, the babies are very healthy," Dong Guixin, general manager of the Chimelong Park, said, according to China Daily, adding: "They now weigh nearly two times what they did when they were born." 

Dong said that the three panda cubs weighed nearly 83 grams (2.9 ounces), 90 grams (3.17 ounces) and 122 grams (4.30 ounces), when they were born.

"Now we have created a miracle. The three pandas have a great chance of staying alive as they are now very healthy," Zhang Heming, director of the China Conservation and Research Center for the Giant Panda, said, according to China Daily.

The cubs were conceived through the natural method when the 14 year-old Juxiao was paired with 17-year-old panda Linlin.

"In September last year, we made them neighbours so they could see each other and get familiarised with things such as smell. Juxiao also had to do more exercise to strengthen herself [for the pregnancy]," Dong said, according to The Guardian, adding: "It was a miracle for us and [the births] exceeded our expectations."