The practice of child sacrifice in Pre-Columbian cultures, in particular Mesoamerican and South American culutes, is well documented both in the archaeological records and in written sources. The exact ideologies behind child sacrifice in different pre-Columbian cultures are unknown but it is often thought to have been performed in order to placate certain gods.
Some researchers have also associated infant sacrifice with Olmec ritual art showing limp "were-jaguar" babies, most famously in La Venta's Altar 5 (to the right) or Las Limas figure. Definitive answers will need to await further findings.
There are also skulls suggestive of child sacrifice dating to the Maya periods. Mayanists believe that, like the Aztecs, the Maya performed child sacrifice in specific circumstances. In the Classic period some Maya art that depict the extraction of children's hearts during the ascension to the throne of the new kings, or at the beginnings of the Maya calendar have been studied. In one of these cases, Stela 11 in Piedras Negras, Guatemala, a sacrificed boy can be seen. Other scenes of sacrificed boys are visible on painted jars.
In Yucatan, child sacrifice continued until the Postclassic Period and even during the first years of the Colonial Period.
"To try and explain why there are 24 bodies grouped in the same place, well, the only way is to think that there was a human sacrifice", archaeologist Luis Gamboa said.
According to Bernardino de Sahagún, the Aztecs believed that, if sacrifices were not given to Tlaloc, the rain would not come and their crops would not grow. Tlaloc required the tears of the young so their tears would wet the earth. As a result, priests made children cry before the infanticidal ritual sacrifice, sometimes by tearing off their nails.
Fernando de Alva Cortés Ixtlilxochitl, an Aztec descendant and the author of the Codex Ixtlilxochitl, claimed that one in five children of the Mexica subjects was killed annually. These high figures have not been confirmed by historians. Hernán Cortés describes an event in his Letters:
And they would take their children to kill and sacrifice to their Idols.
Archaeologists have found the remains of 42 children sacrified to Tlaloc (and a few to Ehecátl Quetzalcóatl) in the offerings of the Great Pyramid of Tenochtitlan.
In Xochimilco, the remains of a three-to-four-year-old boy were found. The skull was broken and the bones had an orange/yellowish cast, a vitreous texture, and porous and compacted tissue. Aztecs have been known to boil down remains of some sacrificed victims to remove the flesh and place the skull in the tzompantli. Archaeologists concluded that the skull was boiled and that it cracked due to the ebullition of the brain mass. Photographs of the skull have been published in specialized journals.
The table below shows the festivals of the 18-month year of the Aztec calendar and the deities with which the festivals were associated. In History of the Things of New Spain Sahagún confesses he was aghast at the fact that, during the first month of the year, the child sacrifices were approved by their own parents, who also ate their children. Child sacrifices appear in red on the column at the far right:
| N° | Name of the Mexican month and its Gregorian equivalent | Deities and human sacrifices | |
|---|---|---|---|
| I | Atlacacauallo (from February 2 to February 21) | Tláloc, Chalchitlicue, Ehécatl | Sacrifice of children and captives to the water deities |
| II | Tlacaxipehualiztli (from February 22 to March 13) | Xipe Tótec, Huitzilopochtli, Tequitzin-Mayáhuel | Sacrifice of captives; gladiatorial fighters; dances of the priest wearing the skin of the flayed victims |
| III | Tozoztontli (from March 14 to April 2) | Coatlicue, Tlaloc, Chalchitlicue, Tona | Type of sacrifice: extraction of the heart. Burying of the flayed human skins. Sacrifices of children |
| IV | Hueytozoztli (from April 3 to April 22) | Cintéotl, Chicomecacóatl, Tlaloc, Quetzalcóatl | Sacrifice of a maid; of boy and girl |
| V | Toxcatl (from April 23 to May 12) | Tezcatlipoca, Huitzilopochtli, Tlacahuepan, Cuexcotzin | Sacrifice of captives by extraction of the heart |
| VI | Etzalcualiztli (from May 13 to June 1) | Tláloc, Quetzalcóatl | Sacrifice by drowning and extraction of the heart |
| VII | Tecuilhuitontli (from June 2 to July 21) | Huixtocihuatl, Xochipilli | Sacrifice by extraction of the heart |
| VIII | Hueytecuihutli (from June 22 to July 11) | Xilonen, Quilaztli-Cihacóatl, Ehécatl, Chicomelcóatl | Sacrifice of a decapitated woman and extraction of her heart |
| IX | Tlaxochimaco (from July 12 to July 31) | Huitzilopochtli, Tezcatlipoca, Mictlantecuhtli | Sacrifice by starvation in a cave or temple |
| X | Xocotlhuetzin (from August 1 to August 20) | Xiuhtecuhtli, Ixcozauhqui, Otontecuhtli, Chiconquiáhitl, Cuahtlaxayauh, Coyolintáhuatl, Chalmecacíhuatl | Sacrifices to the fire gods by burning the victims |
| XI | Ochpaniztli (from August 21 to September 9) | Toci, Teteoinan, Chimelcóatl-Chalchiuhcíhuatl, Atlatonin, Atlauhaco, Chiconquiáuitl, Cintéotl | Sacrifice of a decapitated young woman to Toci, she was skinned and a young man wore her skin; sacrifice of captives by hurling from a height and extraction of the heart |
| XII | Teoleco (from September 10 to September 29) | Xochiquétzal | Sacrifices by fire; extraction of the heart |
| XIII | Tepeihuitl (from September 30 to October 19) | Tláloc-Napatecuhtli, Matlalcueye, Xochitécatl, Mayáhuel, Milnáhuatl, Napatecuhtli, Chicomecóatl, Xochiquétzal | Sacrifices of children , two noble women, extraction of the heart and flaying; ritual cannibalism |
| XIV | Quecholli (from October 20 to November 8) | Mixcóatl-Tlamatzincatl, Coatlicue, Izquitécatl, Yoztlamiyáhual, Huitznahuas | Sacrifice by bludgeoning, decapitation and extraction of the heart |
| XV | Panquetzaliztli (from November 9 to November 28) | Huitzilopochtli | Massive sacrifices of captives and slaves by extraction of the heart |
| XVI | Atemoztli (from November 29 to December 18) | Tlaloques | Sacrifices of children, and slaves by decapitation |
| XVII | Tititl (from December 19 to January 7) | Tona-Cozcamiauh, Ilamatecuhtli, Yacatecuhtli, Huitzilncuátec | Sacrifice of a woman by extraction of the heart and decapitated afterwards |
| XVIII | Izcalli (from January 8 to January 27) | Ixozauhqui-Xiuhtecuhtli, Cihuatontli, Nancotlaceuhqui | Sacrifices of victims representing Xiuhtecuhtli and their women (each four years), and captives. Hour: night, New Fire |
| Nemontemi (from January 28 to February 1) | Five ominous days at the end of the year, no ritual, general fasting | ||