Piaget and other infant researchers had to develop different techniques (such as hiding toys under blankets) to study the thinking of infants because infants lack skills.

verbal

Explanation:

According to my research on studies conducted on child development, I can say that based on the information provided within the question this is done because infants lack verbal skills. Since infants cannot express their thoughts or how they are feeling, researchers need to develop techniques in order to understand their thoughts and feelings.

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