Credit: Instagram

Believe it or not, Maci Bookout's adorable son Bentley will turn 5 years old this October. Time flies right, y'all?! The motocross-racing kiddo has grown up right before our very eyes, and thanks to Maci's incessant Instagramming, we've been able to follow him every step of the way — even without MTV's Teen Mom cameras!

On May 23, Maci treated us to a throwback picture of her main man, and we can't stop fawning over it.

"Holy throwback! when Bentley and i were both just babies! Cuties #tbt #2009," she wrote.

Honestly, we think Maci looks exactly the same, with a few exceptions like her head-to-toe tattoos and hair extensions. But Bentley, on the other hand, couldn't look more different! He's all grown up now and doing big boy stuff, like catching fish and going to the dentist. And let's not forget that time Maci introduced him to crawfish. Priceless!

Can you believe how much Bentley has grown up? Share your thoughts below!