In “The Pout-Pout Fish” children’s picture book, the author weaves words like “aghast” and “grimace” into a story about a fish who thought he was destined to “spread the dreary-wearies all over the ...

But the line between babies making sounds and actually saying words is a bit blurry. After all, children often start out by saying words a little wrongly, so it’s hard to know what counts.