Trecena 7 runs from 1 Quiahuitl through 13 Ozomahtli, monkey, carrying the sequence through rain, flower, crocodile, wind, house, lizard, serpent, death, deer, rabbit and water before closing on the sign that opens Trecena 11 next in the round. Sitting past the count's first third, this trecena's reputation as the sorcerers' week made it, per the general pattern the tonalpouhque's craft followed, one that families actively sought to avoid for a child's birth where the timing of conception allowed any choice at all, though Sahagun's account is clear that birth dates were rarely chosen and the reading instead shaped how a family raised a child born under a difficult sign, through additional penance, a shifted naming day, or heightened attention to the remedies a priest recommended.
The trecena's span crosses none of the four year bearer signs directly as an opener or closer, Quiahuitl and Ozomahtli both standing outside that select group of four, which the tonalpouhque would have noted as one register in which this particular week carried no additional solar year significance beyond its own thirteen days within the 260 day tonalpohualli, its difficulty confined to the divinatory count alone.