The team caring for the newborn seal said he remains in stable condition, said Wende Goo, a NOAA spokeswoman.
"He's moving around and pooping a lot," Goo said. "Although this is good news, NOAA Fisheries remains guardedly optimistic about his chances."
The seal pup was found last week on a beach in a remote area of Kauai's North Shore. A team arrived and found the pup alone. A male and female monk seal joined the pup but attempts to get the female to accept the pup were unsuccessful.