Etymology
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infantilism (n.)

1894 in the psychological sense; see infantile + -ism. Earlier in a physiological sense, "retarded and imperfect physical development," perhaps from French infantilisme (1871).

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Definitions of infantilism

infantilism (n.)
an abnormal condition in which an older child or adult retains infantile characteristics;
infantilism (n.)
infantile behavior in mature persons;
From wordnet.princeton.edu