We’re not Jewish but we have a son, and I did research on this when expecting him. Among Gentiles in the US, it became popular during the Victorian era, IIRC, because it was thought that this would control boys’ urges and make them less horny in their teen years.
In the 20th Century, it grew more popular in the baby boomer years. My older three brothers, at the beginning of the boomer years, were not circumcised. By the time the later two boys came along, it was standard procedure for all boys. Now the practice is being reconsidered again.
http://www.otbrit.com/circumcision/the-mohel/
Crown Prince Charles Circumcised by London Mohel London (JTA) – Crown Prince Charles, son of Princess Elizabeth and heir to the British throne, was circumcised in Buckingham Palace by Rev. Jacob Snowman, official Mohel of the London Jewish community, the Mizrachi News Bureau reported. Rev. Snowman, who is a noted Jewish scholar specializing in the poetry of Bialik, has been ritual circumciser in London for many years.
In BB King’s autobiography, there’s a chapter called “Circumcision is no laughing matter.” He suffered from infections and was circumcised as an adult. It stopped the infections.
Maybe there’s some benefits, but he said he would have rather had it when he was an infant.