Hi Ari!
There are so many wonderful resorts at Walt Disney World that it is hard to choose! I'll give you my favorites for your age groups within each of the price categories.
Value
The new
Art of Animation Resort is going to be amazing! There is going to be amazing theming, surrounding character favorites, such as The Little Mermaid, Finding Nemo, Cars and The Lion King. Right now they are booking family suites, which will be perfect for your three kids to have plenty of room. Your six-month old will love splashing around in the splash area and your two older kids will really love the pool and arcade.
Moderate
Port Orleans - Riverside has just opened up new
Royal Guest Rooms themed around Princes and Princesses. The headboards have fiber optic fireworks that are amazing! The room is filled with surprises, including hidden Mickey's. This is a fun room for kids.
Deluxe
I love the
Polynesian for kids of your ages because the pool is so much fun! Kids also love the Tonga Toast and parents love the fresh coffee from Kona Cafe. This resort is on the monorail line for both Magic Kingdom and Epcot, which will make your life a lot easier! The entire family will love the Spirit of Aloha show with music and dancing. Kids also love the game room, Never Land Club and Lilo and Stich character dining at 'Ohana.
I hope you have a magical vacation!
Magically,
Stacy