Article PubMed
Contraception  (1997)

Fertility regulation in nursing women. IX. Contraceptive performance, duration of lactation, infant growth, and bleeding patterns during use of progesterone vaginal rings, progestin-only pills, Norplant implants, and Copper T 380-A intrauterine devices.

Díaz, S; Zepeda, A; Maturana, X; Reyes, M V; Miranda, P; Casado, M E; Peralta, O; Croxatto, H B