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The researchers emphasize that these differences are a result of the unique environment for twins—such as sharing parental attention and resources—rather than a reflection of parenting quality. The study, published in the journal Child Development, analyzed data from 851 families in the Twins Early Development Study (TEDS).The study is the first to compare twins to their younger, single-born siblings within the same household. This approach allowed researchers to isolate the twin experience from other factors like income and education that often skew developmental research.
