Although they are not mentally retarded, most males with
Klinefelter syndrome have some degree of language impairment. As children, they often learn to speak much later than other children, and may have difficulty learning to read and write. And while they eventually do learn to speak normally, most tend to have some degree of difficulty with language throughout their lives. If untreated, this language impairment can lead to poor performance in school and its attendant loss of self-esteem.
Fortunately, however, this language disability can usually be compensated for. Chances for success are greatest if treatment begins in early childhood.