From Babies To Second Graders: Here's How The Teen Mom OG Kids Have Grown

The MTV munchkins aren't so little anymore

The world first met Amber Portwood, Catelynn Lowell, Farrah Abraham and Maci Bookout before they were teen moms -- and now these four young women are proud parents to lively second graders. We've said it once, and we'll continue to recite it: Time really does fly.

In honor of the inaugural bunch of 16 and Pregnant kiddos beginning a brand-new school year -- you can watch them every Monday at 9/8c -- we're remembering how much they have grown during each installment of the long-running series. Be prepared to feel nostalgic and coo at your screens, folks!

  1. Season 1

    Navigating year No. 1 of motherhood meant some major adjustments for the girls -- including evolving relationships with the fathers of their children (especially Maci and Amber), feuds with parents (Farrah and Catelynn deserve a mention), walking munchkins and celebrating first birthdays.

  2. Season 2

    It's toddler time! An unforgettable stretch for sure, and not just for the children: Highlights included Cate and Ty having an emotional first-year reunion with their little girl Carly, Farrah opening up about the death of her daughter's father and Maci's custody battle with ex Ryan.

  3. Season 3

    Bring on the terrible twos and plenty of changes for the kiddos' parents -- new love interests, legal issues and the munchkins actually talking.

  4. Season 4

    Preschool preschool preschool! And the parents bidding their adorable offspring a (temporary) goodbye.

  5. Season 5

    The OGs are back! Bentley, Leah and Sophia are off to kindergarten -- and the petite gals and guy are able to interact with the cameras and crew, thanks to the decision to break the fourth wall. Oh, and display their spunky and adorable personalities.