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The most effective physical therapy intervention for an infant with torticollis involves supervising prone positioning with the infant's head turned to the same side as the affected muscle. This approach is beneficial because prone positioning encourages the infant to utilize their head and neck muscles differently, promoting active engagement and motor skill development. By having the infant turn their head toward the affected side during tummy time, they can strengthen those muscles while also encouraging range of motion and reducing tightness in the sternocleidomastoid muscle, which is typically involved in torticollis.

Prolonged positioning on the affected side or providing passive stretches may not be as effective, as they do not promote active use of the involved muscles or maintain the developmental benefits associated with positional play. Active participation in movement is crucial for an infant's physical development and helps in remedying muscle imbalances. This method also integrates well into playtime, making it a natural part of the infant's daily routine.

In contrast, interventions like performing cervical range of motion while the infant is sleeping may not be appropriate or effective since the infant is not actively engaged, which limits the potential for muscle strengthening and learning. Similarly, applying electrical stimulation on the uninvolved side would not address the underlying issues of tightness or