Getting girthy! National Zoo’s panda cub growing fast

Mei Xiang’s male cub weighed 2.07 kilograms (4.5 pounds) — nearly a pound more than last week — and measured 15 inches from nose to tail tip. (Courtesy Smithsonian National Zoo)

The Smithsonian Conservation Biology Institute’s Center for Conservation Genomics has determined Mei Xiang’s cub is male — and really packing on the pounds. (Courtesy Smithsonian National Zoo)

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The Smithsonian National Zoo says its panda cub is really packing on the pounds — and that’s a good thing.

In the latest update from the zoo, the cub born to pandas Mei Xiang and Tian Tian has gone through a growth spurt and now weighs in at 4.5 pounds — nearly a pound more than last week.

The cub also added an inch to his midsection (from 12.5 inches to 13.7). He measured 15 inches long from nose to tail tip.

The zoo considered the cub’s growth positive and said he was “quiet and sleepy” while he was being measured.

“All in all, we are happy that our cub is making good gains, and his growth and development are right on track,” wrote Laurie Thompson, assistant curator of giant pandas, on the zoo’s panda blog.

Earlier this week, the zoo announced the cub is male.

Last week, the cub began to open his eyes and now they are fully open. The zoo said his ear canals should open soon and he’s already begun responding to noises around him.

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