No, swimming in a pool, in general, cannot make anyone sick, unless there are contaminates which have survived the highly chlorinated enviro., which is like, 1 in 1 gazillion chances of possibilities, but hey, it’s out there. The myth that swimming after you eat is dangerous has some merit to it (wouldn’t you believe?). Swimming on a (very) full stomach in a deep pool (I’m thinking the ocean, here) can give cramps which, in the most severe cases, might possibly inhibit the swimmer from keeping afloat and could drown them due to the immobilizing cramps. While swimming cramps after eating are very common, fatal cramps are much less so. Some kids, prone to nausea, may get pool-sick after jostling their corn-dog-filled belly for its 100th cannonball, but if they stick to the shallow end for a few mins. (or if you’re an adult, and all you care about is the jacouzzi), there’s no reason whatsoever to keep your kid out of the pool, EXPECIALLY if all they did was have a popsicle or some icecream, which is treated like liquid in the body and is no cause for cramps or nausea.