Hmm, it does sound like it could be the Pampers rewards or baby club programme, I recall someone in my mum group mentioning they signed up through a Pampers promotion during their hospital stay or at a baby fair, where you could choose your diaper size and receive supplies across a few months. The trade-off some mums noted is that a few had trouble tracking which specific sign-up it was, especially if they registered at multiple booths around the same time. It might be worth checking your email inbox for any confirmation from Pampers directly, since those programmes usually send a registration acknowledgement with the details. Either way, contacting Pampers Singapore customer service with your sign-up details seems like the most straightforward way to trace it back.
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