Economics
From a financial perspective, newborn circumcision is roughly ten times less expensive than the cost of adolescent or adult circumcision, mainly due to the added cost of general anesthesia in the latter group. If that group opted for local anesthesia, the cost discrepancy would be greatly minimized. For example, a clinic in California that offers circumcision under local anesthesia over the full range of ages charges an estimated cost difference of $700 for clients age one and older. These clinics provide the service to a population not typically covered by health insurance programs (ages greater than 1), albeit sometimes at a premium, and demonstrate the actual feasibility of circumcision under local anesthesia past the newborn phase.
Medical benefits
In the discourse of the medical benefits of circumcision, three primary arguments are decreasing: 1) risk of urinary tract infection (UTI), 2) risk of penile cancer and 3) risk of transmission of sexually transmitted infection (STI), especially HIV.
Preventing UTI
The risk of UTI for boys is the highest in the first year of life. This risk is significantly higher in uncircumcised boys, but this trend begins normalizing after six months to a similar risk after one year. The risk is attributed to the natural history of colonization of the foreskin and progressive resolution of physiologic phimosis, i.e., the very normal inability to fully retract the foreskin in early life.
Studies have demonstrated this increased risk, but most of these studies are observational studies. Moreover, a significant number of them poorly define their method of urine collection and include bagged urine specimens, notorious for their inaccuracy in diagnosing UTI. The high false-positive rate is attributed to foreskin colonization inevitably sampled by a bagged specimen, thus skewing the risk of uncircumcised boys. However, that increased risk is likely genuine even if the magnitude of the increase is in question. The risk is even higher for boys with another risk factor, such as an underlying urologic abnormality, i.e., vesicoureteral reflux (VUR) or a history of recurrent UTI. UTI risk stems from phimosis. Recent studies reveal that treating phimosis with steroid cream significantly decreases UTI risk to that of circumcised boys. Therefore, treat the phimosis; decrease the risk.
Preventing penile cancer
A case-controlled study from Washington State revealed a higher risk of invasive penile cancer (odds ratio of 2.3) in individuals who were not circumcised as newborns, and the highest risk among those with a history of phimosis (odds risk of 11.4). Two findings from this study: 1) “late” circumcision did not decrease the risk, and 2) there was no increased risk when phimosis, or more precisely penile tear resulting from phimosis, was not present. A systematic review and meta-analysis confirmed these results.
Why is only newborn circumcision protective? Given the prevalence of newborn circumcision in the US, there are many more circumcisions performed later in life for various medical indications usually related to infection, inflammation, scarring or pathological phimosis–risk factors for penile cancer themselves. Performing the circumcision after those risk factors have already occurred will not remove the risk. The mechanism is underlying and already underway.