The female elephant was born to mother Rose-Tu, The (Portland) Oregonian reported.
"She's a pretty active little girl. She's getting her sea legs underneath her," said Chris Pfefferkorn, zoo deputy director.
Veterinarians determined during a checkup Saturday the baby elephant, who has not been named yet, looked healthy and her lungs and heart sounded good, Pfefferkorn said.
"The staff is really happy with how everything has gone so far," Pfefferkorn said. "It's been better than any of us expected. You can see the look of relief on their faces."
Zoo officials have not yet figured out when the newborn and her mother will be on public display, Pfefferkorn said.