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The recurrence risk for siblings is 1%

I'm frequently asked if I know how likely it is to have another child with EA/TEF. The official answer, according to http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1884133/

"The overall risk of oesophageal atresia recurrence in a sibling of an affected child is about 1%."

This refers to having another child from a different pregnancy. In a twin, esophageal atresia is 2 to 3 times more common.