Bryce Harper's personality has really blossomed as a Philadelphia Phillies superstar ... him a custom blue bat, which made it clear that he and his wife Kayla were having a boy.

Philadelphia Phillies ... carried a blue bat into the batter's box, revealing to himself and the entire baseball world that the two-time MVP's fourth child is going to be a boy.

When Bryce Harper went up to bat for the first time in the Philadelphia Phillies’ Monday game against ... fourth child with wife Kayla would be a boy. Taking to social media to explain the ...

There wasn't much for the Philadelphia Phillies ... bat, Harper revealed to the fans in the stadium -- and all around the world -- that the baby he is expecting with his wife, Kayla, will be a boy.