Newborn panda cubs typically weigh only 1/900th of its mother's weight, which is about .2 pounds, making the panda cub the smallest placental mammal baby on earth in proportion to the animal's adult size. When they are born, panda cubs are pink and almost entirely hairless, and their eyes are not yet open, meaning that they look quite different from the iconic black and white, furry animal they turn into as they age. After about a week, these tiny babies begin to develop black patches on their skin, and they begin growing black hairs at two weeks old.
Cheetahs and snow leopards are two big cats that cannot roar, though they make other big cat noises such as chuffing and growling. The sounds a big cat can make depends on certain bone anatomy in the animal's throat, and neither the cheetah nor the snow leopard have the proper anatomical features to allow roaring to occur.