Mark Zuckerberg and his wife, Priscilla Chan, are now the proud parents of two little girls! The tech CEO took to — where else? — Facebook to make the big announcement, sharing a pic of his absolutely adorable family.

“Priscilla and I are so happy to welcome our daughter August,” Zuckerberg wrote alongside the photo.

The couple (who are also parents to 20-month-old Maxima) went on to share a message to their baby girl. “We wrote her a letter about the world we hope she grows up in, and also hoping she doesn’t grow up too fast,” Zuckerberg noted by way of introduction.

The note starts with a reference to the letter they wrote to Max when she was born, in which they expressed their hopes that she would grow up in a world “with better education, fewer diseases, stronger communities, and greater equality.” For their letter to August, they decided to take a different approach: “Rather than write about growing up, we want to talk about childhood. The world can be a serious place. That’s why it’s important to make time to go outside and play.”

They continued, “You will be busy when you’re older, so I hope you take time to smell all the flowers and put all the leaves you want in your bucket now. I hope you read your favorite Dr. Seuss books so many times you start inventing your own stories about the Vipper of Vipp. I hope you ride the carousel with Max until you’ve tamed every color horse. I hope you run as many laps around our living room and yard as you want. And then I hope you take a lot of naps. I hope you’re a great sleeper. And I hope even in your dreams you can feel how much we love you.”

They added that childhood is a “magical” time we only get to experience once, “so don’t spend it worrying too much about the future. You’ve got us for that, and we’ll do everything we possibly can to make sure the world is a better place for you and all children in your generation.”

What do you think about the message Mark Zuckerberg and Priscilla Chan shared with baby August? Let us know @BritandCo!

(Photo via Steve Jennings/Getty Images for Breakthrough Prize)