Please take a look at the Catholic Encyclopedia, limbo is alive and well in Catholic belief.
Thanks. Of course they still teach it. It's part of the doctrine. A somewhat embarrassing part, apparently, but that doesn't stop Rome from putting it out there.
The question therefore arises as to what, in the absence of a clear positive revelation on the subject, we ought in conformity with Catholic principles to believe regarding the eternal lot of such persons. Now it may confidently be said that, as the result of centuries of speculation on the subject, we ought to believe that these souls enjoy and will eternally enjoy a state of perfect natural happiness; and this is what Catholics usually mean when they speak of the limbus infantium, the "children's limbo."We do not define what "children's limbo" means because we "don't know" -- it may be anything, but we know that God is love, God loves Children and Children who die without sinning are only tainted with the sin of Adam, unlike the rest of us.