After saying "I do" to the perfect guy (at her dream wedding, no less) and then giving birth to one of the cutest babies in the history of EVER on tonight's "Teen Mom 2," Kailyn Lowry-Marroquin is finally getting her happy ending. But it doesn't come without hardships. While welcoming the new addition to her family, Lincoln Marshall, has been "awesome," she says in this week's "Teen Mom 2 Featured Moment," Kail and her husband, Javi, also admit that it's been a difficult adjustment for everyone.

"I definitely didn't expect it to be as hard as it is -- as tiring as it is -- with two kids," she admits in the video below. "I nursed the second time around, so my hands are always full, and Isaac's like, 'Mommy! Mommy! Mommy! Mommy!' and I'm like, 'I'm sorry, you have to wait.'" Kail explains that she doesn't want her firstborn to feel "like he's on the back burner for any reason," but having a second child in the mix means dividing her time and attention, which racks her with guilt. Still, nothing can top the joy her kids bring.

"Overall, we love it and everyone's happy," the young mother shares. And Javi feels equally blessed.

"There's times where I just sit and reflect, and think about them growing up...I wake up for them now," he says with a calm smile.

Years ago, "Teen Mom 2" viewers would have never referred to Kail as "lucky," but after much struggle and pain, she is getting closer and closer to knowing true contentment. We couldn't be more thrilled for her.

Check out the clip, and tune in for the 90-minute season finale of "Teen Mom 2" this Sunday at 7/6c, right before the MTV Movie Awards pre-show.

Photo: Michelle Crowe