Oo naman, totoo yan! A few of us noticed the same thing when we switched to S26, one of my mum friends' baby developed rashes around the mouth at chin area, parang milk sensitivity or allergy talaga. It could be the formula, pero better pag-check mo with your pedia to confirm kung it's the milk or something else, kasi may babies rin na naturally prone sa skin irritation, so importante malaman kung ano talaga ang culprit para ma-adjust nyo ng tama.