Watch: A Baby Gorilla Placed in Mom's Arms for the First Time

Uzumma at San Diego Zoo thriving.
3:00 | 03/25/14

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Transcript for Watch: A Baby Gorilla Placed in Mom's Arms for the First Time
And finally tonight, there's nothing like a newborn. The first cuddle. The first kiss. And a mom refusing to let go. Here's ABC's David Muir, showing us, it's not just a human instinct. Reporter: She's the San Diego newborn that survived that risky and rare c-section. Veterinarians, saving mother and baby. The newborn with a collapsed lung. Pneumonia setting in. But a week later, a startling turnaround. Sucking her thumb. Drinking from her bottle. Even getting burped. But hold on tight. What comes next is the biggest test of all. Meeting her mother. They first carried the baby outdoors to the cage where her mother has been ever since. What they call a visual introduction. Baby looking in. Mom looking out. The zoo telling us, the mother holding the baby would come next. And tonight -- the pictures. The moment they put the newborn baby into that cage. She reaches her arms out as they place her in the hay. And from the surveillance cameras, they watch. And so do we. The mother approaches her baby right away. Moving the hay out of the way. Cuddling her. Carrying her. She immediately went right up to the baby, picked it up and held it, which is what woe were looking for. We're thrilled. Reporter: Doctors say in so many way, that newborn gorilla, her reactions, not unlike a newborn human. And look at the same expression from this baby gorilla. And the way they check on the babies, too. Here, holding the baby gorilla's foot, tapping her ankle for reflexes, just as they would with a human in newborn. And human babies and gorilla babies, gripping them. The first crawl, the first steps, five to six months in. Look at little zuma, holding on for dear life. The first crawl, about ten steps, we count. Ten seconds before she turns around. Back to mom. But appearing so confident, she goes for more. And then, right to that camera lens. A star is born. And so is another one tonight, at the San Diego zoo, right in the arms of her mother. David Muir, ABC news, New York.

This transcript has been automatically generated and may not be 100% accurate.

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