It's a male pup, estimated to be less than a week old and weighs just over 16 pounds. He has an infection which SeaWorld veterinarians and animal care specialists are treating with antibiotics. They're also bottle-feeding him a specially designed formula.
He's in critical condition.
“He’s fighting a pretty serious infection, but the good news is that he’s energetic and has a suckling response to the bottle,” said Dr. Hendrik Nollens, SeaWorld veterinarian.
“We’ll continue to monitor him closely, keep him on antibiotics and see how he does. As with all the animals in our rescue program, our goal is to get him well enough to return to the wild, and have a second chance at life.”

Marine animals are abandoned for a number of reasons, according to SeaWorld. Sometimes they are just fine health-wise, but abandoned by their mothers. It also can happen when they're suffering from an illness or infection, like this seal pup.