Hi Lyndsay!
I have two young children, so I always end up shipping diapers, wipes, and other supplies whenever possible. It makes the suitcases lighter and the packing process so much easier!
I have a pause about giving out the names of websites that can do this, but I will say that the one I often use is named after a very long river in South America. (Wink Wink)
Here's a little tip from your buddy Derek:
When you select the website you'd like to use and provide the shipping address of your resort hotel, make sure you indicate somewhere on the shipping address that you are a "Guest Checking-In On: [Insert Date of Arrival]." That way, the cast members will have an easier time keeping track of your package.
If you're not sure about your resort hotel's address, feel free to call Disney at (407) 939-5277 and ask to be transferred to your resort hotel's front desk so you can verify it with a cast member.
Here's a bonus tip from your buddy Derek:
The Baby Care Centers at all four theme parks are absolutely amazing. Not only do they provide really nice diaper changing stations, but they're also well-stocked with supplies in the event you need something for your daughter that you forgot to bring with you. (Plus, the cast members in those centers are super friendly and helpful!)
I hope that helps! If you should have any additional questions, please feel free to write back!
Best regards,
Derek