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Conversation with each other in their baby language. what were they saying? here is cnn's jeanne moos. >> reporter: if you haven't heard the talking twin babies by now, you haven't been listening. >> dada. >> reporter: their mom put the video on her blog and it ended up on youtube and now these two raised baby talk to an art. but now talk has turned to what they are saying. >> they are not really saying anything. they are just babbling. they are imitating each other. >> reporter: dr. harriet kline is an expert in speech development. most people seem to think the kids were talking about socks. ...

Twin baby brothers holding an animated conversation with each other in their own baby language. here's a question, what were they actually saying? there are lots of terrys out there. let's go to cnn's jeanne moos. >> reporter: if you haven't heard the talking twin babies by now, you haven't been listening. >> da, da, da. >> reporter: their mom put the video on her blog. it ended up on youtube. now they've raised baby talk to an art. >> da, da, da, da. >> reporter: but now talk has turned to what they're saying. >> they're not really saying anything. they're just babbling. >> da, da, da. >> ah,...