What is the term for spontaneous fetal death before the complete expulsion from the mother?

The term for spontaneous fetal death before the complete expulsion from the mother is "stillborn fetus." This terminology is used in medical and legal contexts to describe a situation where the fetus dies during pregnancy or labor but is not yet delivered.

In contrast, "live birth" refers to a situation in which a baby is born alive and shows signs of life after delivery. "Sudden infant death syndrome" pertains to the unexpected death of an infant, usually occurring during sleep, and is unrelated to the circumstances of fetal demise. "Active labor" describes the phase of labor where contractions are strong and regular, leading to birth, but does not pertain to the status of a fetus if it has died prior to delivery. Therefore, "stillborn fetus" accurately captures the concept of a fetus that has died before being born.