What is a potential sign of a respiratory issue in newborns?

Pneumonia is a significant respiratory issue that can manifest in newborns. Signs of pneumonia may include difficulty breathing, increased respiratory rate, retractions, grunting, and possibly cyanosis. In this context, pneumonia directly addresses respiratory concerns, as it is an infection that affects the lungs and can severely impact a newborn's ability to breathe effectively.

While the other choices provide insight into different conditions that may affect infants, they do not specifically signal a respiratory issue. A swollen abdomen might indicate gastrointestinal distress or other conditions unrelated to respiratory function. Persistent crying could suggest discomfort or other underlying issues but is not specific to respiratory problems. Gastrointestinal reflux primarily involves the digestive system rather than the respiratory system. Thus, pneumonia stands out as the most direct indicator of a respiratory issue in newborns, highlighting the need for careful assessment and monitoring of respiratory health in this vulnerable population.