Thelen and colleagues' research on the stepping response supports the argument that

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Thelen's research suggests that the stepping reflex doesn't disappear due to neurological reasons but becomes less visible as infants gain weight faster than muscle strength, making it harder for them to lift their legs. When the resistance is reduced, such as in water or with support, the stepping movements can still be observed, indicating the reflex is present but not evident due to physical constraints.

Thelen and Colleagues' Research on the Stepping Response Supports the Argument