Trisomy 18 (Edwards syndrome)

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Information for parents about trisomy 18, a rare genetic condition that causes developmental delay and affects many different organ systems.

Key points

  • Trisomy 18 is a rare condition caused by an extra copy of chromosome 18.
  • Children with trisomy 18 have severe developmental delay, as well as severe birth defects and health problems involving nearly every organ system in the body.
  • It is difficult to predict the life expectancy of a baby with trisomy 18.
  • Parents of a baby with trisomy 18 are encouraged to seek genetic counselling.
Last updated: July 19th 2016