After the tension-filled episode 17 of "Grey's Anatomy" season 11 when Derek (Patrick Dempsey) came home to Meredith (Ellen Pompeo) to work on their marriage, the upcoming episode will be more fun but equally complicated since the resident doctors of Grey-Sloan Memorial Hospital will be visited by a group of curious kids who are having their field trip. 

The sneak peek for the episode titled "When I Grow Up" shows Dr. Arizona Robbins (Jessica Capshaw) conducting a little show-and-tell for the kids wherein she shows them a newborn baby boy who she just operated on before he was born. 

"Now he's two hours old and cute as a button. A healthy little Pop Tart!," the doctor giddily claims.

Dr. Alex Karev (Justin Chamber) is with them at the time and hears everything that Arizona says to the kids. When he asks about the "Pop Tart" reference, Arizona explains that the baby that was born from his mother's womb is like a fetus that has popped.

Alex replies, "You just ruined Pop Tarts for me." 

But the most awkward part of the sneak peek is when a kid asks the doctors what a womb is, since the doctors seem to be unprepared to answer that one. 

Meanwhile, Dr. Stephanie Edwards (Jerrika Hinton) also has a different experience during the kid's field trip. The doctor develops a crush on one of the kids' chaperones, portrayed by "Hawaii Five-O" star Taylor John Smith.

In addition, Dr. Callie Torres (Sara Ramirez) displays her prowess in front of the kids when an injured police officer is required to have an emergency surgery procedure. 

The official synopsis for the episode reads: 

"A school field trip to the hospital takes a dramatic turn when the kids witness two injured cops enter the emergency room. Meanwhile, Stephanie sets her eyes on one of the chaperones, Callie operates on the leg of the police captain and Amelia must face her feelings for Owen." 

"Grey's Anatomy" season 11 episode 18 will be aired on Thursday, April 2.