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Beckwith-Wiedemann syndrome

Beckwith-Wiedemann syndrome is a growth disorder that causes large body size, large organs, and other symptoms. It is a congenital condition, which means it is present at birth. The signs and symptoms of the disorder vary somewhat from child to child.

Infancy can be a critical period in babies with this condition because of the possibility of:

  • Low blood sugar
  • A type of hernia called an omphalocele (when present)
  • An enlarged tongue (macroglossia)
  • An increased rate of tumour growth. Wilms tumours and hepatoblastomas are the most common tumours in children with this syndrome.


Beckwith-Wiedemann syndrome is caused by a defect in the genes on chromosome 11. About 10% of cases can be passed down through families.


Signs and symptoms of Beckwith-Wiedemann syndrome include:

  • Large size for a newborn
  • Red birthmark on forehead or eyelids (nevus flammeus)
  • Creases in ear lobes
  • Large tongue (macroglossia)
  • Low blood sugar
  • Abdominal wall defect (umbilical hernia or omphalocele)
  • Enlargement of some organs
  • Overgrowth of one side of the body (hemihyperplasia/hemihypertrophy)
  • Tumour growth, such as Wilms tumours and hepatoblastomas

Exams and Tests

The health care provider will do a physical exam to look for signs and symptoms of Beckwith-Wiedemann syndrome. Often this is enough to make a diagnosis.

Tests for the disorder include:

  • Blood tests for low blood sugar
  • Chromosomal studies for abnormalities in chromosome 11
  • Ultrasound of the abdomen


Infants with low blood sugar may be treated with fluids given through a vein (intravenous, IV). Some infants may need medicine or other management if low blood sugar continues.

Defects in the abdominal wall may need to be repaired. If the enlarged tongue makes it hard to breathe or eat, surgery may be needed. Children with overgrowth on one side of the body should be watched for a curved spine (scoliosis). The child also must be watched closely for the development of tumours. Tumour screening includes blood tests and abdominal ultrasounds.

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Children with Beckwith-Wiedemann syndrome typically lead normal lives. Further study is needed to develop long-term follow-up information.

Possible Complications

These complications can occur:

  • Development of tumors
  • Feeding problems due to enlarged tongue
  • Breathing problems due to enlarged tongue
  • Scoliosis due to hemihypertrophy

When to Contact a Medical Professional

If you have a child with Beckwith-Wiedemann syndrome and worrisome symptoms develop, call your pediatrician right away.


There is no known prevention for Beckwith-Wiedemann syndrome. Genetic counseling may be of value for families who would like to have more children.


Devaskar SU, Garg M. Disorders of carbohydrate metabolism in the neonate. In: Martin RJ, Fanaroff AA, Walsh MC, eds. Fanaroff and Martin’s Neonatal-Perinatal Medicine. 10th ed. Philadelphia, PA: Elsevier Saunders; 2015:chap 95.

Madan-Khetarpal S, Arnold G. Genetic disorders and dysmorphic conditions. In: Zitelli, BJ, McIntire SC, Nowalk AJ, eds. Zitelli and Davis’ Atlas of Pediatric Physical Diagnosis. 7th ed. Philadelphia, PA: Elsevier; 2018:chap 1.

Sperling MA. Hypoglycemia. In: Kliegman RM, St. Geme JW, Blum NJ, Shah SS, Tasker RC, Wilson KM, eds. Nelson Textbook of Pediatrics. 21st ed. Philadelphia, PA: Elsevier; 2020:chap 111.