Edwards' syndrome

Also called Trisomy 18 or Edwards syndrome

Edwards' syndrome is a rare, serious genetic condition caused by an extra copy of chromosome 18 in some or all of the body's cells. It affects how organs develop, and many babies with it do not survive pregnancy or live only a short time after birth. Some babies, especially with less severe forms, live longer.

Last updated Nov 9, 2026

What it is

It usually happens by chance and is not caused by anything the parents did. The chance increases with the mother's age.

Screening is offered in pregnancy. Care after birth focuses on comfort and support for the family, with specialist teams helping to plan care.

Common signs

  • Small size and low birth weight
  • Heart and kidney problems
  • Clenched fists with overlapping fingers
  • A small head and jaw
  • Feeding and breathing difficulties

How it is usually diagnosed

  • Screening tests in pregnancy
  • Diagnostic tests such as amniocentesis or CVS
  • Chromosome test after birth

Records worth keeping

Keeping these together makes each appointment easier, especially when you see a new doctor:

  • Pregnancy screening and diagnostic test results
  • Scan reports
  • Specialist team letters and care plans

Questions to ask your doctor

  • What does this mean for our baby and the pregnancy?
  • What support is available for us?
  • What is the chance in a future pregnancy?

When to get help right away

Call 112 or go to the nearest emergency department if you have:

  • A baby with breathing difficulty or who stops feeding: call 112 or follow the agreed care plan

This page is general information. It is not a diagnosis and does not replace a doctor who knows your history. Medfold keeps your records organised; it does not interpret them.

Sources