Cross-cultural observations suggest that infants are likely to be carried for longer periods during the day and for more months during infancy when there are more physical risks on the ground.
Given, infants' ability to choose and adjust activities to cross slopes, cliffs, and other obstacles or to deal with changes in their bodies brought on by carrying weights or donning platform or slippery-soled shoes is used to measure given adaptability. Hence, when there are more physical risks on the ground during infancy, babies are more likely to be carried for extended amounts of time during the day and for months at a time.
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