Hi mama! Four months PP, okay lang naman usually, but since you're breastfeeding, kahit mixed feeding pa, mas safe kung tanungin mo muna ang OB mo kung okay lang for your specific situation, lalo na kung may chemicals involved sa treatment. Better safe than sorry, diba, lalo na with breastfeeding pa, even if partial lang. Ask your doc kung ano safe brands or methods sila magrerekumenda para sa peace of mind mo!