What's up with this on the "Shirt Tales" cartoon?

I've been watching episodes of the cute cartoon based on the "Shirt Tales" characters from the 80s (I love Kip. :) ) and I noticed that when the little animals talk, words sometimes appear on the fronts of their shirts (i.e. When Kip is dissapointed, "Sigh" appears on the front of her shirt). I was just wondering why that was?
 
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