The most recent contamination issues have revolved around foods that used milk products that contained melamine. The other issues have been with high lead content in products (non-food).
For the most part Chinese products are safe. And American-sourced stuff can also have issues (though it’s usually easier to trace) too.
I’ve been shying away from Chinese products, unless it’s from a big company that I have a bit more confidence in.
If you’re worried, you might want to write to Walmart, just to check.