first time mother in labor, or giving birth (see Molina)
Alonso de Molina:
yancuicampilhua. primeriza muger en parto. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 30v. col. 2. Thanks to Joe Campbell for providing the transcription.