I didn't really enjoy their "dog-baby communication" either. Although it's somewhat amusing, I could do without it. At least there are only 2 episodes like this...
I don't really like the fact that sometimes, you can only hear the Arthur characters say gibberish instead of real English... most dogs can hear what their owners say... they won't be able to talk back, but they know they're saying something! Same thing goes for babies, too.
Oh, well. I guess it isn't that bad when you think about it...