I agree with PP that a water park is going to be very difficult with a 3 month old. Blizzard Beach has an area that would be appropriate for your 2 year old, but outside of that area, Tike's Peak, I wouldn't feel comfortable with a young toddler. Even areas without a height restriction such as the river and wave pool would make me uncomfortable with a 2 year old. Especially at Typhoon where the wave pool is very rough. The infant is going to be almost impossible to take anywhere except sitting in the shade and maybe sitting in your lap in the very shallow area of the toddler area. They should have life vests for your toddler, but they are first come first serve. I don't believe there would be anything small enough for a 3 month old. I would save the water park for another trip.