The actress and doting mother said despite Jack being born six weeks premature he is huge and has an active personality, reported People magazine.
"My arms have never been toned before and now they are because he's huge! He's got a huge head, a huge body. He's like 60 pounds, He is so active," she said.
Meanwhile, the Faris hasn't been as happy about her husband, actor Chris Pratt's recent weight loss for his starring role in Marvel's comic book film, "Guardians Of The Galaxy".