Hi there, Charli! I hope you are pleasantly surprised when I tell you there are a few options available for your family. Let's get you going in the right direction.
First, if the baby is under two years old, in terms of hotel count, you are a party of six. This is awesome news. The first place you can look at is
Disney's Art of Animation Resort. Featuring adorably themed family suites that can accommodate up to six guests, you'll have a bit of private time with the separate bedroom. There are also two bathrooms and a kitchenette in these reasonably priced suites,
The Cabins at Disney's Fort Wilderness Resort are a rustically comfortable resort featuring cabins that accommodate up to six guests. There is a full kitchen, a charcoal grill, and all the comforts of home. You may even see a deer or armadillo out the door in the morning, so it's added fun for the kids to spot the animals.
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There are also
Disney's Deluxe Villa Resorts. These are great for bigger families. With accommodations for up to 12 guests in these fully furnished villas, your family could do a 2-bedroom. With multiple bathrooms, full kitchen, washer and dryer and other home away from home amenities, you have a perfect place to spread out.
You can get a pack and play for the baby at any resort.
Once you choose your place, add tickets and maybe a dining plan to make it a package. This is probably the easiest way to go.
I hope I've helped you at least get started. Come on back if there's anything else we can help with!
Anna