There’s nothing like being born to one of the richest families in the world! Congrats to Mark Zuckerberg and his wife, Priscilla Chan, who just welcomed their second child — a girl named August.

“Priscilla and I are so happy to welcome our daughter August! We wrote her a letter about the world we hope she grows up in, and also hoping she doesn’t grow up too fast,” he posted on his Facebook profile.

He continues to write a letter directed at August:

“Dear August, Welcome to the world! Your mom and I are so excited to see who you will become,” it reads. “When your sister was born, we wrote a letter about the world we hoped she and now you will grow up in — a world with better education, fewer diseases, stronger communities, and greater equality. We wrote that with all the advances in science and technology, your generation should live dramatically better lives than ours, and we have a responsibility to do our part to make that happen. Even though headlines often focus on what’s wrong, we still believe these positive trends will win out. We’re optimists about your generation and the future.”