Tendai Esoteric Buddhism emphasized Shichibutsu Yakushi ho (praying to the seven Yakushi Nyorai), which was believed to have originated by Ennin, as the one which brings about health and safe delivery, and prayer for safe delivery using Shichibutsu Yakushi ho was conducted at the Fujiwara sekkanke (the families which produced regents) in the 8th -9th century.
天台密教では、円仁から始まったとされる七仏薬師法が息災・安産をもたらすとして重要視され、8-9世紀には藤原摂関家で同法による安産祈願が行われた。