There is no reason to pierce infant's ears. It can be easily done when one gets older. But your comparison is flawed, because pierced ear holes, if not filled,

There is no reason to pierce infant's ears. It can be easily done when one gets older. But your comparison is flawed, because pierced ear holes, if not filled, will easily heal over time, while the circumcision is non-reversible (foreskin will never grow back).