"A precious giant panda cub has arrived!" overjoyed officials announce in a tweet Friday. Mei Xiang is caring for the newborn "attentively."
Veterinarians have found what appear to be fetal tissue during an ultrasound. The zoo says she could give birth in the next couple of days.
A team of scientists and veterinarians at the National Zoo artificially inseminated Mei Xiang on Thursday evening. Giant Pandas are only able to get pregnant for 24 to 72 hours each year.
The Northeast, Southeast, and Mid-Atlantic were blanketed in the season's first snowfall this weekend — prompting some panic, and lots of Instagrammed awe.
Genetic testing also showed that he was sired by Tian Tian, the zoo announced.
"We are sad to report that the smaller of the two panda cubs has died," the National Zoo announced Wednesday, in an update on the twin pandas that were born Saturday.
Mei Xiang, the female giant panda at the National Zoo in Washington, D.C., went into labor on Saturday and gave birth to a cub. Hours later, a second cub was born.