Honestly, I'd suggest checking with your OB or dermatologist kung pregnant or breastfeeding ka, kasi kahit natural ang keratin, the chemicals still get absorbed through your scalp and we're not 100% sure kung safe talaga for baby. A few of us moms in my group actually waited until after breastfeeding to do any treatments, pero some swear na organic keratin is gentler than the regular ones, still, better safe than sorry with baby involved!