The sternomastoid "tumour" of infancy is a firm, fibrous mass that typically appears between two to three weeks of age. It is a recognized cause of congenital muscular torticollis, which may manifest with abnormal head and neck posture, craniofacial asymmetry, breastfeeding challenges, and impaired sensorineural outcomes. These masses are usually well-defined, firm, mobile, and fusiform, often located in the lower third or middle third portion of the sternocleidomastoid muscle. They are commonly and strongly associated with breech presentations and assisted deliveries. We present a case involving a 20-day- old male infant with a swelling on the right side of the neck, diagnosed cytologically and corroborated through radiological findings. This report highlights the classic cytological features of this condition to aid in distinguishing it from other neck swellings in infants of a similar age group.