Causes and Symptoms

Developmental disabilities can be caused by a number of different
factors:
  • Injury to the baby’s brain before birth or during the birth
    process.
  • Mother’s lifestyle. Heavy drinking, drug use, or smoking can lead
    to fetal alcohol syndrome or other forms of brain damage.
  • Rubella or other infectious diseases.
  • Extreme prematurity.
  • Child abuse.
  • Genetic disorders. Down syndrome, phenylketonuria, fragile X
    syndrome, and some degenerative disorders are all caused by
    genetic mutations or an extra copy of a chromosome.
  • Poor diet and health care.
Developmental disabilities are defined by the U.S. government as
disabilities that affect the individual’s functioning in three or more of the
following areas:
  • The ability to live on one’s own
  • The ability to support oneself financially
  • The ability to learn in school
  • The ability to get around on one’s own, by walking, driving, or
    using public transportation
  • The ability to use and understand spoken language
    The ability to take care of one’s personal needs (dressing, eating,
    washing, using the toilet, doing laundry)
  • Self-direction (the ability to make decisions, evaluate situations,
    and generally be in charge of one’s life)

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