The Short Version
This claim presents a dramatic but poorly supported narrative as established fact. It relies almost entirely on Plutarch, who wrote roughly 600 years after classical Sparta. Archaeological excavation of the actual Apothetae site found 46 bodies — all adults, zero infants — suggesting it was used for criminals, not newborns. Most modern historians now treat the cliff-throwing story as myth. While some form of Spartan infant selection may have existed, the specific practice of hurling babies off cliffs is not supported by the evidence.