It seems likely that, even if socioeconomic conditions are similar, children who grow up in a bilingual environment still suffer from slower language development.

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Although studies sometimes show that bilingual children develop language more slowly, the text suggests that this is due to uncontrolled socioeconomic differences between bilingual children and children raised in a monolingual setting. The text concludes that it is probably an advantage for children to grow up in a bilingual environment.
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It Seems Likely That, Even If Socioeconomic Conditions Are Similar