Moustakas announces birth of son: 'Best offseason ever'

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WIBW -- Former Royals third baseman Mike Moustakas announced the birth of his son on Instagram Saturday.

He wrote: "Best offseason ever. This morning we were blessed with a beautiful baby boy. Michael Carter Moustakas. My wife is an absolute rockstar. I love our growing family."

Moustakas and his wife Stephanie also have a daughter named Mila Constance.