We now know that the foreskin is a normal, sensitive, functional part of the body. Raising an intact boy should include empowering him to compassionately respond to anyone who might ever tease him about being normal and whole. Just being strapped down is frightening for a baby. The often repeated statement that babies can't feel pain is not true. Babies are as sensitive to pain as anyone else.
Most babies scream frantically when their foreskins are cut off.
Some lapse into a coma. The reason some babies don't cry when they are circumcised is that they can't cry because they are in a state of shock. Most babies are circumcised without an anesthesic. Anesthetics injected into the penis don't always work. Being stuck with a needle in the penis is itself painful for a baby, just as it would be for anyone else.