Children who appear intelligent and have normal sight and hearing may nevertheless have learning disabilities such as dyslexia difficulty in reading; dysgraphia , difficulty in writing; dyscalculia, difficulty with numbers; and auditory-memory problems that prevent the child from remembering what has just been said. Considered an “invisible” handicap, such learning disabilities can be detected by alert parents before the child goes to school. If the child at about thirty months is not developing normal language skills, something is amiss. A child who cannot do puzzles or put pegs in holes lacks perceptual-moter skills. Kindergartners should recognize the ABCs. First-grader may commonly reverse their letters, writing a d for a b, but if they are still doing this at the start of second grade, they should be tested for learning disabilities. Proper and early treatment is essential.