Dear Teo,
I found a little more information about the Olmecs. These ancient people from 1300-1400 are regarded as the"Mother Culture" of later Middle American civilizations.
Some researchers say they came from Asia, others say they came from Africa.
Their writing is similar to the one used by the Vai people of West Africa. They had a hieroglyphic writing system.
They were clever mathematicians and astronomers.
They were also an agricultural society.
As you have shown us ,they made beautiful pottery and magnificent sculptures. They also carved intricate jade jewelry.
But I am afraid that Margherita is right ,they did sacrifice infants.
This whole topic is very interesting. I will see what else I can find.