On 4th day of 9th month, Harbaugh welcomes baby boy

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Harbaugh took time off practice to attend the birth, but don't expect him to take paternity leave. "Jack Jr. will understand in 20 years," Harbaugh said. "He wants to win, too."

The baby is named Jack after Harbaugh's father.

Forty-niner fans will like this -- his birthday is on the fourth day of the ninth month!

Jack weighed in at 8 pounds, 8 ounces. Dad says that's just the right size for playing linebacker or fullback.

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