[Infant and juvenile gynecology; endocrinological study and present status of juvenile pregnancy].

Three topics were reviewed and our recent study on juvenile menstrual disorders was presented. Endocrinology of puberty and mechanism of onset of puberty: Review. Menstruation and its disorders during puberty. Age of menarche at present was investigated with 7,400 high school girls. No advance of menarche was recognized compared with that of 10 years ago. The rate of irregular menstruation was similar to that of 20 years ago. High occurrence of LH and testosterone increase was recognized among juvenile menstrual disorders. The prognosis of high LH/androgens girls was poor when followed for 5.6 years. Sexual activity among young girls keep increasing. Participation of gynecologist in sexual education was discussed.