Hi Zuli09. It's heartbreaking to hear about your son's discomfort as we have children of our own and we wouldn't want to see them in pain. To give you a little peace of mind, please know that we haven't made any changes to our Pull-Ups Cool & Learn training pants since 2017 and we always go through thorough evaluations to make sure all of our products are delicate on the most sensitive of skin.
That said, it's usual to find out about your child's experience, which is why we'd appreciate a one-on-one conversation to find out how we can help. When you have a chance, can you please give us a call at 1-888-778-5587 (available weekdays, 7:30 a.m. to 7 p.m. CST) or email us at https://www.pull-ups.com/en-us/contact-us? We look forward to our conversation!