WASHINGTON — The National Zoo’s giant panda cub is doing well, according to a recent veterinarian checkup.

At 6 weeks old, Bei Bei’s ear canals are closed and his eyes are partially open. The cub weighs roughly four-and-a-half pounds, bigger than what his siblings were at a similar age.

And if you were to run your finger along the inside of his jaw, you’d feel little bumps. His teeth are starting to come in.

[related_gallery align=”right”]Bei Bei sleeps so much that his caregivers say it’ll take months to determine his personality. He just might be a mama’s boy.

“Sometimes when she puts him down on the ground, he will vocalize in a way that sort of seems to say, ‘I’m ready for you to pick me back up,’” panda keeper Marty Dearie tells WTOP.

As a cub, Bei Bei’s big sister Bao Bao was far less concerned with their mother Mei Xiang, Dearie says.

“Maybe he’s a little bit more demanding on Mei than Bao Bao was, and that’s sort of reminiscent of his brother [Tai Shan],” she says. “So, maybe it’s a boy thing.”