Specifically, I think it was Sparta that did this. Not all Greek city-states.
Sounds about right.
Young Ben Junior once started expressing admiration for the Spartans — and I asked him how he felt about the Helots.
He hadn’t heard of them.
Nah. All ancient peoples practiced infanticide, mostly though not exclusively of girls.
AFAIK, the only ancient people that did not were the Jews. Ancient writers often remarked on this astonishingly odd custom, raising all the children born to them!
I have to remind many that the 300 were pedophiles. Is Sparta the only ancient Greek city that no longer exists?