Here's something to try ya big bleeping midden,tell your son no! Wen my kids were wee and we went swimming they both at least once tried to make a beeline for the big pool as I'm sure a lot of kids have but cause I wasn't a strong swimmer I stuck to the wee pool till they were a bit bigger so they were hauled back in to the Wee pool don't like it tough lol sorry I know I'm not experienced in having a child with additional needs but from every other parent here who does every single one of uz have said u tell your children no or explain to them in a way they will understand. Sure take them out if they aren't enjoying the pool but I think vav just doesn't put the effort in to trying to distract him and telling him no we can't go in there today