They are called quintuplets.
If you mean "What are eight babies born on the same day called?": Octuplets (if born by the same mother)
Quadruplets.
Septuphundredlets
quintuplets, I believe.
Eight babies born together are called octuplets
A group of six babies can be referred to as a "half dozen babies."
mother or/and father
Until they resemble humans, they are called embryos. After that until birth they are called fetuses.
when two babies are born at the same time are callled twins!
Four babies born at once are quadruplets.
If they were all born from one pregnancy they would be sextuplets