I calculated how many diapers by tracking what our daycare typically did. I figured if I changed my son once every three hours (while he was awake that is in a 16 hour time frame), I would go through about 6 diapers during the day times 7 days or 42 diapers for a week. Add in a few extras, and I would say 50 is a good estimate. On our cruise, we stayed at the Poly for 3 days first, so I ...