As a point of interest, "Parents who circumcise their children often do so for religious or cultural reasons. The religions of Christianity, Islam, and Judaism require or recommend circumcision. Circumcision is also common in some parts of Africa, Australia, and the Middle East. Other reasons for circumcision include: Hygiene, Preventing diseases such as
urinary tract infections, sexually transmitted infections, and cancer, Family reasons, like the father being circumcised, Personal reasons"
Circumcision is the surgical removal of the foreskin, the tissue covering the head (glans) of the penis. Learn about the benefits and risks in this overview.
www.webmd.com
So in many cases, the children are not Jewish, and the circumcision would be religiously done for Jewish boys by an authorized person in the Jewish sect.