«INFANT.RU», «INFANT.MAVS» - 1-3 years old children vocalizations and speech corpora, spontaneous and read speech of 4-7 years old children speech corpora «CHILD.RU», and emotional speech of 4-7 years old children speech corpora «EmoChildRu» were developed by Child's speech research group of Saint Petersburg state university. These original corpora are the first on Russian language material. The speech material contained in the child's speech corpora is the basis for multidisciplinary researches: different aspects of speech formation, their correlation with child's cognitive and emotional development.