Lycurgus (16.3-16.4)

Their nurses, too, exercised great care and skill; they reared infants without swaddling-bands, and thus left their limbs and figures free to develop; besides, they taught them to be contented and happy, not dainty about their food, nor fearful of the dark, nor afraid to be left alone, nor given to contemptible peevishness and whimpering. This is the reason why foreigners sometimes bought Spartan nurses for their children. Amycla, for instance, the nurse of the Athenian Alcibiades, is said to have been a Spartan.[*]

And yet Alcibiades, as Plato says,[*] had for a tutor, set over him by Pericles, one Zopyrus, who was just a common slave. But Lycurgus would not put the sons of Spartans in charge of purchased or hired tutors, nor was it lawful for every father to rear or train his son as he pleased, but as soon as they were seven years old, Lycurgus ordered them all to be taken by the state and enrolled in companies, where they were put under the same discipline and nurture, and so became accustomed to share one another’s sports and studies.