It was deaf, and we examined a point to keep in mind of the cochlear implant wearing effect of the cochlear implant wearing deaf child who had the minor developmental disease derived from low weight birth and the preschool guidance and, as a result, suggested the following things. 1. The low birth weight deaf child did near language development to a premature baby of normal hearing and deaf singularity children by having worn cochlea at 3's. 2. The cochlear implant wearing effect for the low birth weight history deaf child to 3's was high. 3. It was thought that it was necessary to get a learning condition ready after it extracted an individual problem early, and having predicted a prognosis.
