Hi Jane,
Welcome to the Disney Parks Moms Panel and thank you for asking us a question! I completely understand wanting to save precious luggage room during your trip across the “pond” to Walt Disney World Resort, especially when you’re travelling with a baby!
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Baby Care Centers and most Walt Disney World Resort hotels usually stock Huggies brand diapers and Nestle brand baby formula. The price changes frequently, but you can expect to pay a few dollars more than what you’d find in a regular (off-site) store for baby items and other essentials.
If you prefer another brand, or if you’d like to save a few dollars on your purchases, I have a recommendation for you. Our little guy’s first trip was when he was 5 1/2 months old. I ordered baby essentials (diapers, formula, wipes, sunscreen, even baby shampoo) online and had the package delivered to my Walt Disney World Resort hotel. You can find the address on your Resort hotel's main page (look on the far right corner, towards the bottom of the screen). Amazon can send you some of these essentials, as well as any of your favourite American retailers that has an on-site presence. On some other trips when I had access to a rental car, I would drive to the nearest store and pick things up when I arrived.
I hope my answer helps you plan your visit. It’s coming up soon! Please don’t hesitate to come back and see us if you have any other questions.
Have a Magical Day,
Lynne