As revealed by the birth certificate obtained by People, Kourtney Kardashian and Travis Barker have named their newborn son Rocky Thirteen Barker.

They welcomed their first child together on November 1 at Cedars-Sinai Medical Center in Los Angeles.

After a week, the 44-year-old socialite and Blink-182 drummer were spotted leaving the medical facility together.

Although the couple has not made a public announcement about the arrival, an insider told The Sun that Kourtney is “over the moon” about her child.

The tipster also revealed that Kourtney has adopted a strict “invite-only” policy, “The couple will spend time bonding with the newborn before inviting other family members.”

The source revealed that the protocol arises from the Poosh founder’s fear of germ transmission: “Kourtney has said it’s a germ thing, but it’s also part of her new strategy to keep everyone at arm’s length.”