Mental retardation is a side effect of Down syndrome. Down syndrome or trisomy 21 (or Down's Syndrome in British English) is a chromosomal disorder caused by the presence of all or part of an extra Twenty-first chromosome. Children with Down syndrome tend to share certain physical features such as a flat facial profile, an upward slant to the eyes, small ears, a single crease across the center of the palms, and an enlarged tongue. A doctor can usually tell if a newborn has the condition through a physical exam. Down Syndrome also causes mild to moderate mental retardation.
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fetal alcohol syndrome
Mental retardation may be caused by an inherited abnormality of the genes, such as fragile X syndrome.
down syndrome
Fetal alcohol syndrome. This includes decreased development of the fetus, intra-uterine growth retardation, mental retardation.
About one-third of individuals with CP have moderate-to-severe mental retardation, one-third have mild mental retardation, and one-third have normal intelligence.
Varicella syndrome in a newborn is characterized by abnormally small limbs and head; scarring of the skin; eye defects; and, mental retardation.
Chatterbox syndrome refers to a condition resulting from hydrocephalus where the individual suffers from severe mental retardation but is unimpaired or overdeveloped language skills.
Lesch-Nyhan syndrome is a rare genetic disorder that affects males. Males with this syndrome develop physical handicaps, mental retardation , and kidney problems.
appear normal at birth but their development is delayed. Most boys with fragile X syndrome have mental impairment. The severity of mental impairment ranges from learning disabilities to severe mental retardation
Affected children with Hurler syndrome lose previously attained skills (milestones) and eventually suffer from profound mental retardation
Overstudy does not cause mental retardation.