When Elijah “Eli” Delgado first started experiencing stomach pain, doctors told his mom, Leanne, it was most likely a gastrointestinal issue. She knew it had to be more than that because stomach problems runs in the family and Eli’s symptoms were different than those of his older brother.

“As a parent, you have that gut feeling you know something’s wrong with your child,” Leanne says.

Eli’s stomach pain continued for another...