I know people who worked for HR in frum companies and they told me many insurance companies did not want their business because of the large familes and likelyhood of larger payouts due to larger families.
Before you claim Anti-Semitism, A pregnancy costs about $7000 and a C-section $15,000, and thats before all the kids getting sick and having to go to the doctor. Why would a For-Profit company want to have a customer who costs them money.
Under the new laws that would be illegal