September 15, 2006 07:35 PM

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.

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