Abstract Autocommunication, communication with oneself, may become distinct from communication with an “other” both in form and function. Autocommunication has a special role in the development of thinking in small children, as differentiation of speech for oneself, known as “private speech,” from communication for social purposes entails the child’s organization of her or his own cognition and behavior with the aid of symbols. Recent studies have suggested that speech distinctly for the child him or herself is particularly observable during what is called “crib speech” and thus it appears to support already early language acquisition. The purpose and functions of crib speech in child development have been topics of interest until recently, but they are still debated. In autocommunication, instead of transfer of signs from one mind to another as when in communication with an “other,” there is transfer of signs from one state of mind to another, as in the case of recalling something with the help of signs. Next to this mnemonic type autocommunication, Juri Lotman was interested in the type in which textual devices within a text guide the communicative interpretation in relation to the text itself, particularly characteristic to poetry. The paper provides a semiotic analysis of crib speech in terms of Lotman’s concept of autocommunication explaining its particular appearance both in form and content, as well as what initiates and inspires it for the small child and why does it bring such joy. From the point of view of semiotics, crib speech presents as an exceptionally rich phenomenon. In addition to being small children’s language practice, crib speech appears as language play, if not poetry, serving as a modelling system for enacting and representing the world as it appears for the small child.