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.
They are called quintuplets.
quintuplets
quintuplets
Quintuplets
Septuplets
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Quintuplets
They are called Octuplets.