SAN DIEGO -- The San Diego Zoo's resident toddler panda is 2 years old.

The zoo presented Hua Mei Tuesday with a birthday cake made of ice, bamboo and other treats aimed at inspiring a little playtime.

The panda weighed a mere 4 or 5 ounces a few days after birth, but now tips the scales at a hefty 150 pounds -- fueled by the 15 pounds of bamboo she eats every day.

Hua Mei became the first panda born in the United States to survive past four days and is the only surviving giant panda cub born in the Western Hemisphere in more than a decade.

She is the product of artificial insemination of Bai Yun with sperm from Shi Shi.

The adults are in San Diego on a breeding loan from China. Hua Mei, whose name means "China USA" in Chinese, also belongs to that country.

Last week, keepers gave up hope that Bai Yun might again be pregnant. She was artificially inseminated in April and showed signs earlier this summer of being pregnant, but that was apparently just a "pseudo pregnancy."