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Michigan football head coach Jim Harbaugh wrestles with his son Jack during a satellite camp at Bishop Chatard High School in Indianapolis, Indiana on Wednesday, June 1, 2016.

(Melanie Maxwell | The Ann Arbor News)

ANN ARBOR - Michigan coach Jim Harbaugh announced Wednesday afternoon that his wife Sarah gave birth to their son.

"Arriving early, weighing in at 4 lb 13 oz, with an 18 in wing span, our newest Wolverine teammate, John Harbaugh. Precious... God is good..." is what Harbaugh tweeted at 4:35 p.m. on Wednesday.

Arriving early, weighing in at 4 lb 13 oz, with an 18 in wing span, our newest Wolverine teammate, John Harbaugh. Precious... God is good... — Coach Harbaugh (@CoachJim4UM) January 11, 2017

John's first words uttered and witnessed by Deb Berman & great @MottChildren staff were "who's got it better than us" s/o to Brandon NICU — Coach Harbaugh (@CoachJim4UM) January 11, 2017

Last week, while he and Sarah appeared at the White House, Harbaugh announced a due date for the child as Feb. 6. John is also the name of Harbaugh's brother, who is the coach of the Baltimore Ravens.

Harbaugh, 53, now has seven children. He and Sarah have four children in Addison, Katherine, Jack and John. Harbaugh also has three children - Jay, James Jr. and Grace - from a previous marriage. Jay Harbaugh is Michigan's tight ends and special teams coach.

Harbaugh was in Nashville, Tenn., as late as Tuesday night for the American Football Coaches Association's 2017 convention, which started on Sunday and ended today.