Try salt crystal stones. You just wet them and rub them under your arms. Salt crystal stones is made from minerals and salts that occur in nature. In theory, the thin layer of salt applied to your skin can prevent the growth of bacteria, and thus control odor. A crystal can be very low cost and can last up to a year.
arent all deodorant breastfeeding safe?? why would deodorant be dangerous? .. sigh, so much i don't know (or, did someone make up this s*** to scare people?)
check out EWG for safer deodorants. im using Hugo Natural if i remember the name correctly
thanks