Definder - what does the word mean?

What is new sibling syndrome?

When children who have recently acquired a younger sibling feel so excluded that they pretend the new member of the family simply doesn't exist.

Mary: "Who is that?" (motions to John's younger sibling)
John: "What are you talking about? I don't see anything."
Mary: "Oh John, I forgot you are still suffering from new sibling syndrome."

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new sibling syndrome - video

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