MSFinals-4537

A 4-month-old boy is brought to the clinic by his parents as they are concerned about a possible heart condition. The baby was born full-term and has had no major health issues except for a mild cold. After examining the child, the consultant paediatrician suspects the presence of a patent ductus arteriosus (PDA).

What is a clinical feature that would indicate the presence of a PDA in this infant?