The word for today is…

infantilize (UK infantilise) (verb) – 1. To treat or condescend to as if still a young child.
2. To reduce to an infantile state or condition.

Source : The Free Dictionary

Etymology : Infantilize is just a baby, relatively speaking. It first saw the light of day in the early 1900s, when social scientists started using the term to discuss the ways in which treating humans as helpless can prolong or encourage their dependency on others. The adjective infantile, which gave birth to infantilize, is far more mature: it dates to the 17th century. Infantile sometimes literally means “relating to infants”—that is, to children in the first year of life—but it also has a broader meaning. If you chide someone for their infantile behavior, you rebuke the person for acting immaturely or childishly.

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