A 5-week-old infant with failure to thrive is likely to have which accompanying features?

In the context of a 5-week-old infant with failure to thrive, the presence of a hyperdynamic precordium with a holosystolic murmur suggests a potential cardiac condition, such as a congenital heart defect leading to volume overload. A hyperdynamic precordium indicates increased blood flow and potentially significant cardiovascular workload, which often correlates with heart conditions that can lead to failure to thrive due to inadequate perfusion or excessive calorie expenditure.

The holosystolic murmur typically signifies the presence of a condition that causes backward flow of blood, such as ventricular septal defect (VSD), which is common in infants and can contribute to the clinical picture of tachypnea, feeding difficulties, and consequently, failure to thrive. Infants with such conditions may not gain weight appropriately due to their increased metabolic demands and potential complications from inadequate circulation or respiratory distress.

In contrast, the other options may suggest various clinical issues but are less directly associated with the scenario of an infant presenting primarily with failure to thrive related to a significant underlying medical condition. Low-grade fever, rash, lethargy, bradycardia, jaundice, hypotonia, and poor reflexes might indicate infections, metabolic disorders or neurological issues, which could lead to failure