The birth had created excitement across Japan, and the nation was mourning the baby’s death.
Tokyo’s Ueno Zoo said the male panda, which had not been named yet, died of pneumonia Wednesday morning.
A zookeeper found the baby, which was born last Thursday, lying belly up and not breathing, on his 7-year-old mother’s chest.
He was pronounced dead an hour later after resuscitation efforts failed. He was 6 inches long and weighed only 4.4 ounces.
• From wire dispatches and staff reports