TV Guide asked Jessica whether babies might be in Callie & Arizona's future:

"What then about Callie and Arizona adding a mini-Calzona to their family? Jessica Capshaw, who plays pediatric surgeon Arizona Robbins and is the real-life mom to 2-year-old son Luke, says, “In my character research, I’ve found a lot of real life pediatric doctors don’t want to have their own children because everyday they see all the horrible things that could happen.”"

The full article can be found here.