Combined oral contraceptives are not the preparation of first choice in breastfeeding women as they may influence the quality and quantity of breast milk. In these cases, a progestogen-only pill is a suitable alternative, since progestogen-only pills contain no estrogen at all and a much lower dose of progestogen than do combined oral contraceptives
Therefore, progestogen-only pills may also be more acceptable than combined oral contraceptives to women suffering from medical conditions that are associated with the use of combined oral contraceptives (e.g. nausea, headache and breast tension).