Infants are likely to reach motor milestones at different ages depending on culture.This is probably due to:

Question

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Activity opportunities provided by a culture influence an infant's ability to reach motor milestones. Different cultures provide different levels of opportunity for infants to engage in activities that promote the development of motor skills. For example, a culture that emphasizes crawling may have infants reaching the crawling milestone earlier than a culture that emphasizes walking.

Infants Are Likely to Reach Motor Milestones at Different Ages