Giant panda cubs are born weighing about the same as a stick of butter, approximately 100 grams. Initially, they are entirely white and develop their iconic black-and-white fur pattern as they grow.

The boy and two girls weighed just 46 grams at birth, but six weeks later, they are now nearly 10 times that amount at 350 grams each. The kits are being hand-reared by a team of dedicated keepers at ...