Didn’t the Spartans expose their disabled newborns to the elements and wildlife?
They had a spot (still there, obviously) called “the place of rejection”. The high-end citizens would meet there, inspect the baby, and “vote him off the island” if not “perfect”. They just hurled the infant to his death. Members of the two royal houses were by and large not put through this, and none of the girl babies. The goal was to maintain the fitness of the master race which made up the army and ruled the whole area. There were no walled settlements allowed, and no weapons allowed among those under the thumb of Sparta.