The term congenital disorder is considered to have the same meaning and two terms are used interchangeably. In other words about 1 in every 7100 babies born in the United States each year are born with pulmonary atresia. Birth Defects Affect Us All Read These Inspiring Stories From Families Affected By Birth Defects A 2019 study using 2010-2014 data from birth defects surveillance systems across the United States researchers estimated that each year about 550 babies in the United States are born with pulmonary atresia. What are considered birth defects . According to March of Dimes. Birth defects can be defined as structural or functional abnormalities including metabolic disorders which are present from birth. Causes and Risk Factors.