What happens that makes a child be born with cystic fibrosis?

Genetic disorder. CF is an autosomal recessive genetic disorder. The infant must inherit a CF gene from both parents (who are CF gene carriers) to be born with this disorder. This disorder occurs in one out of every 3, 500 white births and one out of every 20, 000 black births. All 50 states now have newborn screening programs to identify infants born with cf.
Get it from parents. It is a genetic disorder that a child gets from both parents who have to be carriers of the disease.