美国现在的趋势是新生儿割包皮的逐年降低。1979年三分之二的新生儿割，2010年只有58%

In 1979, close to two-thirds of boys in the West underwent a hospital circumcision after birth, but by 2010 that percentage dropped to around 58%.

http://healthland.time.com/2013/08/22/explaining-the-drop-in-circumcision-rates/