What is the ruling on amputating a specific extra part of a human, such as an extra finger, and disposing of it with waste, or should it be collected and buried in Muslim cemeteries?

The matter is broad regarding handling the embryo into which the soul has not yet been breathed. It is permissible to place it in the waste or bury it in the earth out of respect, and burying it is better. It is not obligatory to wash or bury it unless it is a fetus that has exceeded four months of gestation.