The San Diego Zoo staff is amazed that Bai Yun has just had another baby.
Bai Yun went into labor around 11 a.m. on Saturday, according to zoo officials. Researchers estimate Bai Yun delivered the cub just after 2 p.m.
We don’t know the gender yet, but the zoo says the cub weighs around 100 grams.
Bai Yun is almost 21 years old and is the second oldest panda to have given birth at the zoo.
She was given an ultrasound on Thursday, July 26 which clearly showed a panda fetus, according to zoo officials. The spine and a leg were visible and veterinarians were also able to detect the heartbeat.
Bai Yun was paired with Gao Gao, a 20-year-old, rescued, wild-born giant panda earlier this year.
This is the sixth cub born at the San Diego Zoo and the most born at a breeding facility outside of China. All six giant panda cubs have been born to Bai Yun.
It could take animal care staff up to two months to determine the sex of the cub.
To check up on Bai Yun, watch the San Diego Zoo panda camera online.