Serena Williams has posted an adorable message to her baby

This is very sweet.

Last week, Serena Williams announced that she was pregnant with her first child. She posted a picture to Snapchat of herself in a yellow swimsuit showing off her 20-week bump. Now, she's followed it with an Instagram post dedicated to the little baby. In it she said:

"My Dearest Baby, You gave me the strength I didn’t know I had. You taught me the true meaning of serenity and peace. I can't wait to meet you. I can't wait for you to join the players box next year. But most importantly, I am so happy to share being number one in the world with you.... once again today. On @alexisohanian bday. from the world's oldest number one to the world's youngest number one. Your Mommy"

My Dearest Baby, You gave me the strength I didn’t know I had. You taught me the true meaning of serenity and peace. I can't wait to meet you. I can't wait for you to join the players box next year. But most importantly, I am so happy to share being number one in the world with you.... once again today. On @alexisohanian bday. ? from the world's oldest number one to the world's youngest number one. -Your Mommy

A post shared by Serena Williams (@serenawilliams) on Apr 24, 2017 at 6:06am PDT