A future Yankees captain?

Derek Jeter announced on Twitter Monday that he and his wife, Hannah, welcomed a son into the world on Friday.

Jeter captioned the post, “Welcome to the world lil man!!” while tagging Hannah.

He also shared an image of the name “Kaius Green Jeter” and the date “5-5-23.”

Derek, 48, and Hannah, 33, previously had three daughters.

Jeter updated his Instagram bio and it now reads, “Sleep-deprived father of four.”

The couple, which mainly keeps their relationship private, had not previously announced that Hannah was pregnant.