I believe they are called quintuplets.
Five babies born at the same time are called quintuplets.
Six babies born at the same time, all to one mother, are called sextuples. :)
Quadruplets
Three babies born to the same mother at the same time are called triplets.
Septuplets
quintuplets
quintuplets
They are called quintuplets.
Quintuplets
quintu
Quintuplets
quintuplets, I believe.