Meet Joanne, the San Diego Zoo’s Growing Baby Gorilla

— -- They grow up so fast.

Remember the baby gorilla born by C-section at the San Diego Zoo? Well, the 16-week-old girl is already rolling over, sitting up and scooting forward. She’s even cut her first teeth.

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The baby, named Joanne after the first chairwoman of the Foundation of San Diego Zoo Global, Joanne Warren, is becoming more independent, according to zoo officials. But she’s still pretty attached to her mom, Imani, riding on her back as she forages for food.

"While Imani is eating browse, we've seen Joanne grab a handful and mouth it," zookeeper Jami Pawlowski, said in a statement, referring to the spiny plant, acacia browse. "She's got about six teeth now so it's not quite enough to chew browse, but she definitely mouths and will suck on it.”

“Anything big and attractive that her mom is holding, Joanne will try to investigate," Pawlowski added.

Joanne was born March 12 after a rare emergency C-section. She weighed 4.6 pounds at birth and had to be nursed through a bout of pneumonia and a collapsed lung by a team of vets as her mom recovered from surgery. She's expected grow to a whopping 200 pounds.

Most baby gorillas walk within six months, according to the National Zoo, and they’re ready to leave their moms by age 3.

By age 7, female gorillas are ready to have families of their own.

The typical lifespan for gorillas in zoos is 54 years.