An Illinois teen who was born in a Starbucks bathroom 18 years ago had a heartwarming reunion with the barista who helped his mom give birth. At the Starbucks in West Edens Plaza in Wilmette last month, Jonathan Celner was reunited with Griffin Baron, who was a 21-year-old Starbucks manager on the day Jonathan’s mother went into labor at the establishment. “I heard high-pitched screams coming through the wall and thought someone had locked themselves in the bathroom,” Griffin told The Record Northshore, explaining that he had been on break around 5 p.m. on that fated day in 2002. After arriving on the scene, Griffin asked a customer, Tricia Monico, to go into the bathroom and see what was going on. What she reported was nothing like what he’d imagined. “When Tricia came out her face was white and she said, ‘Call 911,’” recalled Griffin. “Then she said, ‘This lady …