赤あかちゃん返がえり

noun

infantile regression

Medical/psychological term for reverting to infant-like behavior, often used for young children after a sibling's birth or during stress.

• 下したの子こが生うまれてから、上うえの子こに赤あかちゃん返がえりが見みられる。

  Since the new baby was born, the older child has been showing signs of infantile regression.

• 赤あかちゃん返がえりは一いち時じ的てきなもので、安あん心しんさせてあげれば自し然ぜんに治おさまることが多おおい。

  Infantile regression is usually temporary and often resolves naturally if you provide reassurance.