There are great questions. It's very clear about pregnancy... one should not use during pregnancy. We know from scientific studies in women who used oral minoxidil during pregnancy that the baby can be harmed. But it's less clear during breast feeding. It's quite easy for doctors to say "no", one should not use during breastfeeding. Certainly, one does not want to cause harm to the baby. But these issues about when to start minoxidil are extremely important to women. A closer look at the scientific evidence on recommendations from international experts suggests that use of minoxidil during breastfeeding is best discussed on a case by case basis. In 2001 the American Academy of Pediatrics published a helpful guide as to the safety of medications during breastfeeding. It's important to always check with your physician before starting any medication during breastfeeding. However, topical minoxidil was felt to be safe for women who are breastfeeding. The reference is below.Any woman who wishes to use minoxidil while breastfeeding should check with her physician. It's best reviewed on a patient by patient basis.