Synonyms for Babbling (same or very similar meaning)
WordNet sense 1 (gibberish resembling the sounds of a baby):
babble, lallationWordNet sense 2 (talking idly or incoherently):
blithering, blathering, jabberingWordNet sense 3 (marked by a ready flow of speech):
volubleFrom the ODE community, based on WordNetadd/edit