Veterinarians will try to examine the cub again Tuesday. Its eyes have yet to open, and its gender will not be known for two to three weeks. A DNA sample was collected to determine the cub's paternity. Mei Xiang was artificially inseminated with sperm from Tian Tian (tee-YEN tee-YEN), the male panda at the National Zoo, and a panda named Gao Gao at the San Diego Zoo.
Zoo officials aren't sure what prevented the stillborn cub from developing, but it had abnormalities around its head and was missing its brain. Results from a necropsy won't be known for several days.
Associated Press Writer Jessica Gresko contributed to this report.