Mark Zuckerberg and Priscilla Chan Welcome Baby Girl, Pledge 99 Percent of Facebook Shares to Charity

Mark Zuckerberg Daughter

Photo: Courtesy Mark Zuckerberg via Facebook

Huge congratulations are in order for Mark Zuckerberg and his wife, Dr. Priscilla Chan! The Facebook founder announced the birth of their first child, a baby girl, Tuesday on — where else? — Facebook.

"Priscilla and I are so happy to welcome our daughter Max into the world!" Zuckerberg wrote. Their little bundle arrived early last week, weighing in at 7 lbs., 8 oz., and mom and baby are healthy and doing well, People reports.

In addition to a sweet photo of the new family of three, the birth announcement revealed the launch of the Chan Zuckerberg Initiative, an organization with the mission to advance human potential and promote equality. In an open letter to their baby girl, the new parents revealed that they will contribute 99 percent of their Facebook shares — currently worth about $45 billion, according to People — during their lives to advance the cause.

Priscilla and I are so happy to welcome our daughter Max into this world!For her birth, we wrote a letter to her about...

Posted by Mark Zuckerberg on Tuesday, December 1, 2015

The couple also outlined their hope's for Max's future. "Your mother and I don't yet have the words to describe the hope you give us for the future," Zuckerberg writes. "Your new life is full of promise, and we hope you will be happy and healthy so you can explore it fully. You've already given us a reason to reflect on the world we hope you live in."

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Zuckerberg continues, "We will do our part to make this happen, not only because we love you, but also because we have a moral responsibility to all children in the next generation. We believe all lives have equal value, and that includes the many more people who will live in future generations than live today. Our society has an obligation to invest now to improve the lives of all those coming into this world, not just those already here."

In July, the couple used the social media platform to reveal they were expecting a daughter following years of trying and three miscarriages.

Congrats to the new family!

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