excrement of children (see Molina); could also conceivably be excrescence of children (e.g. mucus, saliva)
IPAspelling:
koneːkwitɬɑtɬ
Alonso de Molina:
conecuitlatl. suziedad de niños. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 24v. col. 1. Thanks to Joe Campbell for providing the transcription.