Which condition is NOT typically associated with infant reflux?

Cystic fibrosis is a genetic disorder that primarily affects the lungs and digestive system by causing the production of thick and sticky mucus. While this condition can lead to various gastrointestinal issues, it is not characteristically associated with the common phenomenon of infant reflux. Reflux in infants, specifically gastroesophageal reflux (GER), typically involves the backflow of stomach contents into the esophagus and is commonly linked to conditions that directly impact the gastrointestinal tract's ability to function properly.

In contrast, gastroesophageal reflux disease (GERD) is an extension of normal infant reflux and is directly involved with esophageal motility and inflammation, making it relevant to the question. Pyloric stenosis, a condition where the opening from the stomach to the intestine is narrowed, can also lead to vomiting and complications that may mimic or exacerbate reflux symptoms. Eosinophilic esophagitis is an allergic inflammatory condition affecting the esophagus that results in reflux-like symptoms. However, cystic fibrosis does not have a direct correlation with these types of reflux and is primarily concerned with lung and pancreatic function. This distinction illustrates why cystic fibrosis stands out as the correct answer in this context.