Hi Debbie! Traveling with infants and toddlers can take creative packing so it is best to plan ahead. I have used the great grocery service, gardengrocer.com and have been very pleased. However, if you are simply needing to have baby items then I suggest you box up a supply of diapers, wipes, and any other items you might need and ship that ahead. If you are in need of something that is a bit out of the norm then this is very important to ship it all. Recently I heard a guest needing to find an outside store as they were out of a large size of pull-ups that Disney did not carry. You don't want to take time out of your day to hunt down any item that you might need. Normally I have attempted to have the box arrive about 3-4 days before my check-in date. Be sure and address it to you (put it in the name as the reservation states), with your arrival date listed below your name. Add the resort name and address which you can find on the Disney website,
www.disneyworld.com, when you check the home page for each resort.
When you arrive be sure and alert the front desk that you should have a box waiting for you. Be persistent if they don't find it at first try as each resort seems to have several safe places they keep things. New cast members often must check with managers to find items such as this but I have yet to not have the box waiting for me. Bell Services will then deliver it to your room.
Remember if you do forget something each park has a Baby Care Center that are supplied with a great deal of things for you to purchase if necessary.