Mr. Twigg's Mistake by Robert Lawson

The curious story of Mister Twigg—who works for a company that madkes a breakfast food called Bita-Vita.

Mr. Twigg's job is to add the correct amount of Vitamin X to the product, but because of a pesky headache, he makes a mistake as it's being packaged.

Then there's a boy named Squirt, and a baby mole named General DeGaulle, the latter of which eats some the Bita-Vita with truly amazing results!

All this makes for a delightful story that will charm any child from about age 7-8.