Never forget that you have your own common sense, plus your knowledge of your children to guide you:   you are smart enough (and experienced enough) to be able to spot dangers with your own eyes, and you know your own child well enough to know what kind of dangers tempt him. But in case you still feel a little uneasy....

The Consumer Product Safety Commission keeps a sharp eye on dangerous products, and they have a website: CPSC.GOV
Click the CONSUMER button. Then click PUBLICATIONS.
Then click CHIILDRENS FURNITURE. And then select the topic that concerns you most.

And don't forget to consult with your local children's furniture retailer. Remember that he deals with these issues every day, and the fact that he is still in business (after twenty years, say) indicates that he knows what he is talking about, and that you can trust him on this issue.