I've got to agree with ralfsmouse here, the Pal and Kate episodes do feel much more like Rugrats than Arthur, even if the sole reason is because they share the same concept. And while it's a cute idea, I don't think it works here, and I think the reason why is because Pal and Kate are too intellectual and perfectly spoken. The reason why it worked so well with Rugrats is because when the babies talked and played together, they still acted like babies, even if most of that came down to how often they would purposely mispronounce their words. When Kate talks to Pal, she often feels more like a child prodigy, and in my opinion, that shouldn't be.