We have used Dermal Therapy with 10% lactic acid since Natalie was an infant. She never seemed to have any discomfort with it, and anything less wouldn't have been potent enough. We used AmLactin with 12% when she was a toddler, and it did sting a bit at times. We haven't used the AmLactin in over a year, however, as it just stopped working. Will try again in a few months as it was very helpful for our daughter's nb-CIE.
Mom to three gorgeous princesses all affected with significant medical challenges, one of whom has CIE.