Sir Paul McCartney was hit with the baby bug last week.

The Beatles rocker was spotted at posh children’s boutique Egg by Susan Lazar in Southampton, where we’re told he picked up several items.

Asked if he’s going to become a grandfather again, sources tell us he was buying for a friend’s daughter.

McCartney, a father of five, released his latest single last week, “New,” and the album, also called “New,” his first since 2007, is due in October.