[US Standard Certificate Of Birth Field 46]. This class represents an observation regarding the delivery of the infant. Possible values include: Was delivery with forceps attempted by unsuccessful? - Yes; Was delivery with forceps attempted by unsuccessful? - No; Was delivery with vacuum extraction attempted by unsuccessful? - Yes; Was delivery with vacuum extraction attempted by unsuccessful? - No; Fetal presentation at birth, Cephalic; Fetal presentation at birth, Breech; Fetal presentation at birth, Other; Final route and method of delivery, Vaginal/Spontaneous; Final route and method of delivery, Vaginal/Forceps; Final route and method of delivery, Vaginal/Vacuum; Final route and method of delivery, Cesarean, trial of labor attempted; Cesarean, trial of labor not attempted.