A 3-month-old girl presents for a routine check-up, and her parents express concern about the shape of her feet, which they noticed shortly after birth. She was born full-term at 38 weeks via uncomplicated vaginal delivery to a G2P2 32-year-old woman. Her general health is good, she is feeding well, and meeting age-appropriate developmental milestones, including social smiling and head control. Her temperature is 37.0 C, blood pressure is 70/45 mmHg, pulse is 135/min, respirations are 28/min, and oxygen saturation is 99% on room air. A comprehensive physical examination reveals bilateral foot deformities, similar to the findings shown in Figure A. Specifically, the feet demonstrate a fixed plantarflexed (equinus) position, the forefeet are turned inward and supinated (adductus and varus), and there is an increased arch in the midfoot (cavus). These deformities are rigid and resist passive correction. No other musculoskeletal anomalies are noted, and her neurological examination, including primitive reflexes, is entirely normal. Given these findings, what is the most likely diagnosis and the most appropriate initial management strategy for this patient?