Quintuplet pregnancy refers to a rare medical condition where a woman is pregnant with five fetuses simultaneously, typically as a result of fertility treatments or hormonal therapies, which increases the risk of premature birth and other complications for both the mother and the infants. Quintuplet pregnancies are very uncommon and pose significant health risks, hence medical intervention and close monitoring are essential to ensure the best possible outcomes for all involved.

Quintuplets are a rare medical phenomenon referring to the simultaneous birth of five babies from one pregnancy, which are usually premature and require extensive medical care.

A medically precise definition of 'Selektiver Abort, Mehrlingsschwangerschaft' (selective abortion in multiple pregnancies) would be: A medical intervention in a multiple pregnancy where one fetus is terminated to reduce the risk of morbidity and mortality for the remaining fetuses and the mother.

Multiple Pregnancy is a condition where a woman carries more than one fetus simultaneously, which can be either twins, triplets or even higher-order multiples, and it increases the risk of various pregnancy-related complications compared to a singleton pregnancy.