'Teen Mom 2' Star Jenelle Evans Shows Off Her Son

Jenelle Evans is finally showing off her newborn son, Kaiser Griffith. "She was screaming for about eight hours!" Nathan Griffith exclusively tells OK! of his girlfriend Jenelle's delivery ordeal.

Griffith and Evans are determined to be responsible parents to the bouncing baby boy, who weighed in at 7 lbs., 10 oz. when he was born on June 29. They hope to buy a home together and Griffith, 26, reveals he's planning to attend college to become a civil engineer while 22-year-old Evans is currently studying for a medical clinical assistant degree.

Kaiser looks so sweet now, but his arrival wasn't exactly peaceful. "For me, it was a bunch of mixed emotions," shares his proud papa, Griffith, who also has a daughter named Emery from a previous relationship. "I cried when she was in pain and I cried when the baby was born. I was just a mess!"

Evans is fully committed to keeping sober and away from heroin now that she's become a mom for the second time. "There were no drugs in her system and the baby tested fine for everything," says Griffith. "Jenelle is really focused on staying healthy and drug-free. She's on a really good path."

Griffith also wants to become a dad to Jace, Evans' 4-year-old son with her estranged ex, Andrew Lewis. "I want custody of Jace," insists Nathan. "He listens to me, and I'm a good role model for him. I look at him as one of my kids."