Where to buy baby supplies? Diapers, etc

Hello,

I will be visiting Singapore for a few days with my wife and 1 year before departing on a cruise. I am trying to convince my wife that we don't need to fill our luggages with baby supplies, because we can buy some while we are in Singapore. I tried searching but I couldn't figure out specific stores that sell disposable diapers and other supplies that we need for the cruise. I've heard people order online using Shopee, but I would have to double check to see if our hotel can accept packages