Final answer:
The scar that forms where the umbilical cord was attached to the baby is called the navel or belly button, which is left after the umbilical stub dries out and falls off.
Step-by-step explanation:
The scar that forms where the umbilical cord was attached to the baby is called the navel or belly button.
After birth, the umbilical cord, which contains the umbilical artery and vein, is double-clamped and cut, leaving a short stub.
This stub will dry out, darken, and eventually fall off, typically within three weeks, to become what we commonly refer to as the navel or belly button.