"middle-child syndrome" meaning in English

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          "ref": "1975 January 15, Scrabble For Two [pseudonym], “[Confidential chat] New baby was charm”, in The Boston Globe, volume 207, number 15, Boston, Mass.: Globe Newspaper Co., →ISSN, page 34:",
          "text": "I, too, was expecting my third child and was concerned about the “middle-child syndrome.” And all the things I had read and heard about happened as soon as I brought the baby home. Plus other symptoms developed as time went on. For three years, we had a typical middle child even though we tried to make him feel important.",
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          "ref": "1993 March 8, Jerry Adler with Ray Sawhill, “As Groundhog Has His Day: Bill Murray, making it on a sneer and a shoeshine”, in Newsweek, →ISSN, page 53, column 2:",
          "text": "As the fifth of nine children, growing up in a comfortable Chicago suburb, he may just be suffering from the world’s worst case of middle-child syndrome.",
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        {
          "ref": "2016, Jessi Klein, “All the Cakes”, in You’ll Grow Out of It, London: Two Roads, →ISBN, page 41:",
          "text": "I have middle-child syndrome and generally bounce around rooms like a Labrador retriever trying to make sure everyone is okay.",
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        "Alternative form of middle child syndrome."
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  "word": "middle-child syndrome"
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  "lang_code": "en",
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          "ref": "1975 January 15, Scrabble For Two [pseudonym], “[Confidential chat] New baby was charm”, in The Boston Globe, volume 207, number 15, Boston, Mass.: Globe Newspaper Co., →ISSN, page 34:",
          "text": "I, too, was expecting my third child and was concerned about the “middle-child syndrome.” And all the things I had read and heard about happened as soon as I brought the baby home. Plus other symptoms developed as time went on. For three years, we had a typical middle child even though we tried to make him feel important.",
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          "ref": "1993 March 8, Jerry Adler with Ray Sawhill, “As Groundhog Has His Day: Bill Murray, making it on a sneer and a shoeshine”, in Newsweek, →ISSN, page 53, column 2:",
          "text": "As the fifth of nine children, growing up in a comfortable Chicago suburb, he may just be suffering from the world’s worst case of middle-child syndrome.",
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          "ref": "2016, Jessi Klein, “All the Cakes”, in You’ll Grow Out of It, London: Two Roads, →ISBN, page 41:",
          "text": "I have middle-child syndrome and generally bounce around rooms like a Labrador retriever trying to make sure everyone is okay.",
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        "Alternative form of middle child syndrome."
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  "word": "middle-child syndrome"
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