Infants of the Hopi tribe are routinely strapped to cradleboards until one year of age, which greatly retards their motor development because this deprives their brain of appropriate motor input.

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Quizplus · Accepted Answer

Infants of the Hopi tribe are indeed traditionally strapped to cradleboards, but this practice does not greatly retard their motor development. Research has shown that despite different early motor experiences, children across various cultures achieve motor milestones at similar ages, suggesting that motor development is resilient to these variations in early experiences.

Infants of the Hopi Tribe Are Routinely Strapped to Cradleboards