"He'll probably be a pitcher, so when Gunner steps to the mound, he's going to be gunning those throws down home plate".
He also made clear he expects the couple's first child to have an athletic future. "It just applies to all sports".
Sitting down with Us Weekly for the cover of the publication's newest issue, the proud parents showed off their little man, and he's too cute!
Gunner's followers were loving the post and some even revealed just how jealous they were of the newborn, writing, "He already has more followers than me lol".
Heidi and Spencer, who have been together for 10 years, have already set up an Instagram account for their baby.
It was captioned "My first cover", which leads us to think there will nearly definitely be more in the future!
The family of three happily posted their magazine cover on Instagram, with Pratt calling his newborn son a "miracle baby".
"Miracle baby! Welcome to the world my angel", the new mom, 31, Instagrammed the image.
And, speaking of that name, Heidi also shared: "Gunner has been on my top names since before Spencer even agreed to have kids". "We went back and forth, but it just seemed like the best fit".
Us Weekly notes that the new parents disagree on whether Stone is Gunner's middle name or is attached to his first name.
Are you a fan of Heidi and Spencer?