Hormonal methods are a definite option while you are breastfeeding, but not all of them are appropriate: products containing estrogens should not be used because this hormone can have an effect on milk production. Progestin on the other hand, is an option - especially those with "local" effects such as hormonal intrauterine systems (IUS). The volume and composition of breast milk are not affected. Three-monthly injections, progestin-only pills and hormonal implants are other contraceptive options for women who are breastfeeding. Ask your doctor or healthcare provider for further information.