Britney and Kevin give their new son the same initials as big brother Sean Preston

Britney Spears and Kevin Federline have named their newborn son Sutton Pierce Federline, sources close to the couple tell PEOPLE.

The infant, born Tuesday at a Los Angeles hospital, now has the same initials as his big brother, Sean Preston Federline.

The boys also (almost) share a birthday – Sean Preston turned 1 on Thursday, just two days after his brother was born.

Sutton Pierce has two half-siblings as well: sister Kori, 4, and brother Kaleb, 2, his dad’s kids with actress Shar Jackson.

A rep for Spears declined to comment.