The Florentine Codex provides a huge number of metaphors for a newborn baby, including necklace, feather, bracelet, round thing, smoky turquoise, green stone, chip, flake, fragment, hair/fingernail, precious thing, and more. Yet, a specific word for newborn baby does not appear here. See Book 6, chapter 34. This chapter has many phrases for speaking to the baby, the mother, and to the old men and old women who help take care of the baby. In chapter 35, we see pipiltotonti translated as babies, but nothing is added here for newborn babies.
injc qujntlapaloaia in pipiltotonti: ioan in jntahoan, in jnnanoan = to greet the babies and their fathers, their mothers (central Mexico, sixteenth century)
Fr. Bernardino de Sahagún, Florentine Codex: General History of the Things of New Spain; Book 6 -- Rhetoric and Moral Philosophy, No. 14, Part 7, eds. and transl. Arthur J. O. Anderson and Charles E. Dibble (Santa Fe and Salt Lake City: School of American Research and the University of Utah, 1961), 189.
Intla telpuchpan poviz piltontli: in anoҫo cihoapiltontli: notzalo in telpuchtlatoque = If the baby boy or the baby girl was to belong to the telpochcalli, the rulers of the youths were summoned (central Mexico, sixteenth century)
Fr. Bernardino de Sahagún, Florentine Codex: General History of the Things of New Spain; Book 6 -- Rhetoric and Moral Philosophy, No. 14, Part 7, eds. and transl. Arthur J. O. Anderson and Charles E. Dibble (Santa Fe and Salt Lake City: School of American Research and the University of Utah, 1961), 209.