This study is investigated to the young children's concept formation about sex. Research questions were as follows; 1) Is there any difference about concept of sex according to young children's age and sex? 2) Is there any difference about concept of difference on the sex according to young children's age and sex? Subjects of this study were 158 children of 4 and 5 years of age from D and S Children's House in J city. The researchers interviewed the subjects by using a specially designed interview format. Responses of children were classified in accordance with criteria developed by researchers on the basis of the researcher's previous studies, the study of Jeong(1991), Jeong(1996) and that of Park(2001). The data was analyzed by M, SD, two independent t-tests and frequencies, percentages with spss/pc program. The study results found that 1) gender identity and gender stability of 4 years old and 5-year-old children were developed almost mostly, and Young girls were expose that develop little more. 2) The 4 years old and 5-year-old children were recognizing about biologic difference of man and woman regardless of age and that girls were recognizing little more high. Children who respond that biologic special quality is same responded that appearance and psychological special quality are equal. And that consecrated vessel is identical, ratio that recognize is low. If examine infants who respond that there is biologic difference, was recognizing that dress and sexual gland are different mainly. But, that body part is different when painted, ratio that express is high.

This study is investigated to the young children's concept formation about sex. Research questions were as follows; 1) Is there any difference about concept of sex according to young children's age and sex? 2) Is there any difference about concept of difference on the sex according to young children's age and sex? Subjects of this study were 158 children of 4 and 5 years of age from D and S Children's House in J city. The researchers interviewed the subjects by using a specially designed interview format. Responses of children were classified in accordance with criteria developed by researchers on the basis of the researcher's previous studies, the study of Jeong(1991), Jeong(1996) and that of Park(2001). The data was analyzed by M, SD, two independent t-tests and frequencies, percentages with spss/pc program. The study results found that 1) gender identity and gender stability of 4 years old and 5-year-old children were developed almost mostly, and Young girls were expose that develop little more. 2) The 4 years old and 5-year-old children were recognizing about biologic difference of man and woman regardless of age and that girls were recognizing little more high. Children who respond that biologic special quality is same responded that appearance and psychological special quality are equal. And that consecrated vessel is identical, ratio that recognize is low. If examine infants who respond that there is biologic difference, was recognizing that dress and sexual gland are different mainly. But, that body part is different when painted, ratio that express is high.

perception of sex, gender identity, gender stability, gender constancy, perception of difference at sex