Mrs. Beautiful, maybe you are thinking of the Gifts to Grow program. But for that you need to save special codes, not UPCs. The codes are printed on little stickers that are inside the diapers packages & in multi-pack wipes containers are printed on the outside of each individual wipes package. You need to enter each unique code at the pampers website.
Since you mentioned the pampers program, I’ll add that for those who buy Huggies jumbo packs of diapers/ pull-ups/ swim diapers, if you save your receipts you can get a $0.75 rebate for each package. You can download the rebate form at caregiversmarketplace.com, and it includes many other products as well. You do need a minimum of 5 items to redeem the rebate, and you can send it in through the end of 2009.