I was going to take my daughter, who is 3 and will be 4 in May, but decided not to for many reasons. But when she was going to go, they said they would allow her to go in the nursery, if needed. She isn't potty trained and is a bit delayed. So, I don't think you will have a problem. I totally understand why you would be worried. My son is 5 and I am nervous about him being in the kids club, but we shall see. As far as the Aquaduck slide. I have no clue. I was selfish as well and decided to do the Dream because it is newer and has the slide
We have first seating. Good luck getting yours changed.
Our son is delayed as well. He's more on a 2 year old level with his speech and was delayed physically also. His delays aren't really apparent except his expressive speech. This is the reason I think we'll put him in the nursery if they will take him. We really only want to use it 1-2 hours a day for us to have an hour to ourselves and to be able to finish dinner without rushing. So, I don't think it will be a big problem either way. I just want to be able to feel secure the time that he is in there. I keep telling myself that this is Disney and hundreds of 3 year olds sail with them each day. I'm sure they know what they are doing. We'll see! Hope to see you on the ship!