Lead poisoning is a serious condition and should be treated right away. Lead sometimes is found in dust, soil, or paint, though the problem of lead in paint has been known about for many years and mostly eliminated. But many toys are made in other countries, so they may still be a problem.
If you have concerns about your child’s toy having lead in it, your best bet is to call your local health department for information. There are home test kits out there, but at this time, they are considered unreliable.