That cheap labor is exactly what has brought countless people out of extreme poverty in many countries that over the years have had the competitive advantage of cheap labor. This is how Japan and south Korea started. You can see it in process with China and many others.

I'm not sure how taking away what little industry they have by refusing to buy their products helps these countries.

While I find it said that children are working in many countries today, I'm also not glib enough to think that is those jobs are taken away, their parents will just send them to school instead and they'll go on to live a happy life.