Abstract
384 5- and 6-year-olds from white, urban, native born, intact, 2-child families were divided into 24 groups of 16 each and matched on the basis of age, class of father''s occupation, neighborhood etc. and rated by teachers on certain voice and speech characteristics. Boys talked and stuttered more than girls. When the age difference between siblings was large, the first born opposite in sex tended to stutter more. In parallel sex pairs this trend was reversed. First born children articulated better than 2d born. Girls, when the sibling was near in age, articulated better than boys but at wider spacings no sex difference was apparent.

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