Beckwith-Wiedemann Syndrome

Beckwith-Wiedemann syndrome is a rare genetic condition that causes overgrowth in babies and children. It affects about 1 in 10,000 births worldwide. Children with this condition often grow faster and larger than typical, especially during infancy and early childhood.

The syndrome happens when genes that control growth do not work correctly. Specifically, a gene called IGF-2 becomes overactive. IGF-2 stands for insulin-like growth factor 2, a protein that helps cells grow and divide. When the body makes too much IGF-2, growth happens too quickly. This can affect different parts of the body in different ways.

Most children with Beckwith-Wiedemann syndrome grow up healthy with proper monitoring and care. The condition can increase the risk of certain childhood tumors, particularly in the first 8 years of life. Regular screening helps doctors find and treat any problems early. Many symptoms become less noticeable as children grow older.

• Larger than average body size at birth, often weighing more than 8 pounds 13 ounces
• Enlarged tongue that may stick out of the mouth
• Abdominal wall defects where organs protrude through the belly button area
• Creases or pits in the skin near the ears
• One side of the body growing larger than the other
• Enlarged organs including liver, spleen, or kidneys
• Low blood sugar in newborns and infants
• Distinctive facial features with a prominent forehead
• Red birthmark on the forehead or eyelids

Symptoms vary widely from person to person. Some children have many features of the syndrome while others have only a few. The severity of symptoms also differs greatly among affected individuals.

Beckwith-Wiedemann syndrome results from changes in genes on chromosome 11 that control growth before and after birth. These genes normally work in a balanced way, with some promoting growth and others limiting it. When this balance gets disrupted, overgrowth occurs. Most cases happen randomly, not inherited from parents. About 85% of cases are sporadic, meaning they occur without a family history of the condition.

The genetic changes involve a process called imprinting, where certain genes are turned on or off depending on which parent they came from. When imprinting goes wrong, the IGF-2 gene becomes overactive and produces too much growth factor. Risk factors include older maternal age and use of assisted reproductive technologies like in vitro fertilization. However, most families have no identifiable risk factors. A small percentage of cases, about 10 to 15%, run in families with an autosomal dominant pattern.

Doctors diagnose Beckwith-Wiedemann syndrome based on physical features and genetic testing. A clinical examination looks for characteristic signs like macroglossia, which means enlarged tongue, and abdominal wall defects. Genetic testing confirms the diagnosis by identifying specific changes in chromosome 11. This testing looks at DNA methylation patterns and gene mutations that disrupt normal growth control.

Blood tests may measure IGF-2 levels, which are often elevated in people with this syndrome. However, specialized genetic testing is needed for a definitive diagnosis. Talk to your doctor about testing options if you suspect this condition. Prenatal ultrasound can sometimes detect signs before birth, such as increased size or abdominal wall defects. Early diagnosis helps families prepare for specialized care and monitoring.

• Frequent blood sugar monitoring and feeding schedules for infants with hypoglycemia
• Surgery to repair abdominal wall defects if present
• Tongue reduction surgery if enlarged tongue causes breathing or feeding problems
• Regular tumor screening with abdominal ultrasounds every 3 months until age 8
• Blood tests to check for tumor markers like alpha-fetoprotein
• Physical therapy and orthotics if one side of the body grows differently
• Speech therapy to help with communication if tongue size affects speech
• Nutritional support and feeding therapy for infants with feeding difficulties
• Ongoing monitoring by a team of specialists including geneticists and pediatricians