Amazon has 20% max S&S (instead of 15%) for select baby ...- amazon prime day diapers coupon 15% 20% ,The 20% baby item subscribe and save discount has been around forever. I've used it for the last 7 years as a prime subscriber. It isn't limited to just baby items either. I've bought contact solution and some other household health items over the years that have also been discounted 20% instead of 15% …Baby Registry Diaper Discount @ Amazon.comOn your baby's arrival date, Amazon will automatically apply a 20% promo code on your diaper purchases for the next 12 months; You can combine this discount with Subscribe and Save and get up to an additional 20% off - totaling 40% off your diaper orders