PHILADELPHIA — Bryce Harper is set to take another swing at fatherhood — and he did it with a blue bat.

The Philadelphia Phillies slugger used a blue bat in his first plate appearance of Monday night’s game against San Francisco as part of a gender reveal for his fourth child.

A two-time NL MVP, Harper announced in a team meeting that his family was set to grow. He later asked All-Star shortstop Trea Turner for an assist with a most unusual reveal.

Harper had ordered two custom-made bats…