Prebiotics as bovine colostrum are considered as a valuable supplement in the prevention of upper respiratory tract infections, gastrointestinal tract infections and neonatal sepsis. It contains many bioactive substances, such as immunoglobulins, lactoferrin, lysozyme, lactoperoxidase, and other growth factors.There is a lack of research on the use of prebiotics for prophylaxis against recurrent urinary tract infection (UTI) in children.In this era of increasing bacterial resistance to antimicrobial therapy, bovine colostrum can offer an approach for prophylaxis against UTI in these patients.We aim at this trial to evaluate the efficacy and safety of bovine colostrum as a prebiotic for prophylaxis against recurrent urinary tract infection in children.