Duff took to Instagram to share a snap of Ryan's little legs resting on top of her snoozing dog, Chicken, reported Ace Showbiz.
"Chicken's favorite spot to sit while I feed Ryan. #BFFs," she captioned the image.
Duff, 30, and fiance Matt Rosenberg welcomed their first child on May 11.
Duff, a cooking show host and lifestyle blogger, has been engaged to Matt since April 2014. In December that same year, she publicly confirmed that they were expecting their first child together and at the same time revealing that they were expecting a baby girl.