Credit: Twitter

The Teen Mom kids are growing up so fast that we can’t help but feel nostalgic for the days of yore when those kiddos were first popped out. We guess that Maci Bookout's mom and Bentley’s grandma, Sharon Bookout, was feeling the same because on Thursday she tweeted, “#ThrowBackThursday Me and Benny. Time flies my friends!” along with an adorable pic of the proud nana posing with the newborn.

Aww!

Bents is already a pro at posing for the camera (we wouldn’t expect anything less from the son of Teen Mom heartthrob Ryan Edwards!), and ever the advanced kid, he already has his eyes open.

Besides not being able to get over alert Mr. Benny all swaddled up in his hospital blanket, we’re amazed by the resemblance between Mace and her mama. Except for Sharon’s fierce and feathered bangs, they are practically twins!

It’s hard to believe that this tiny tot is now almost 5 years old. Just yesterday Maci tweeted about watching her little guy problem solve like a champ, and he recently learned to tie his shoes. If you ask us, Bents is practically ready for a spin-off of his own!