Jason Aldean's son is getting bigger fast — especially his adorable little belly.

Aldean's wife, Brittany, has been documenting son Memphis' early days via social media, and she turned once again to Instagram on Friday to share a precious photo of the baby boy securely snugged into what appears to be a car seat, dressed in cute green pajamas and little white gloves, with his cute little baby belly pooching out adorably as he gazes placidly up at the camera.

"The belly tho," his proud mama writes to accompany the picture, adding a series of heart emojis.

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Little Memphis ' hair is also growing very rapidly; he was born with quite a bit of dark hair already, but this new picture makes it look like his first trip to the barber might be just around the corner.

The couple welcomed Memphis Aldean Williams on Dec. 1 at 1:29PM. He weighed 9 lbs., 5 oz. at birth. They announced his arrival in an Instagram photo of the newborn cradled in his mother's arms, with her saying it was "hands down the happiest day of my life."

Memphis is Brittany's first child, and Aldean's first son. He also has two daughters from his first marriage, and Aldean tells Taste of Country he is looking forward to doing "guy things" with Memphis. "Hunt, fish, playing baseball in the yard and all that kind of stuff, I’m looking forward to all of it."

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