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In page Melanie Klein:

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Klein also goes on to say that infants recognize that their achievements, such as crawling and walking, give their parents joy. In one observation, Klein says that the infant wishes to evoke love and pleasure in their mother with their achievements. Klein says that the infant notices that their smile makes their mother happy and results in the mothers attention. The infant also recognizes that their smile may serve a better purpose than their cry.[citation needed]