For the slides you have to be 48 inches or taller to ride and less than 300lbs.
Only restriction is kids have to be 48" to go down the slides.
There is a height restriction on the 2 high slides. One is open and one is covered. I think that it is 48 inches. I also noticed lifeguards flagging smaller kids in the lazy river if no adult is present with them.
The only restrictions that I am aware of are concerning the use of the slide. All children must be at least 48 inches tall to ride. I do not believe I saw anything concerning weight though.
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