Honestly momsh, I'd check with your OB or derma first kung okay lang ang specific whitening products while breastfeeding, better safe than sorry, diba? A few of us in my mommy group actually just stuck to gentle, unscented soaps during that phase and saved the whitening stuff for later, pero it really depends sa brand and ingredients. What I will say is that whatever you use, make sure it's from a trusted brand and always patch test first!