Breastfeeding is a natural form of oral contraception, called the lactational amenorrhea method (LAM), and is about 98% effective if the nursing is regular and frequent. Progestin-only oral contraceptive is recommended in this patient since it will not interfere with breastfeeding. Estrogen suppresses milk production so the estrogen only or combined estrogen/progestin oral contraceptive would not be appropriate in a patient who is breastfeeding. Oral contraceptives are a perfectly acceptable contraceptive option for this patient.