Is wimpy kid the best selling children book?

While the Wimpy Kid series is incredibly popular and has sold millions of copies, it's difficult to definitively say it's the *best-selling* children's book of all time.

Here's why:

* There's no official, universally agreed upon list: Sales figures are often kept private by publishers and it's hard to track across different countries and languages.

* Defining "children's book" is subjective: Is it based on age range, genre, or other criteria?

* Classic books have long-term sales: Books like "The Very Hungry Caterpillar" or "Goodnight Moon" have sold consistently for decades, making their overall sales potentially higher.

However, the Wimpy Kid series is undoubtedly one of the most successful children's book series in recent years, and it's definitely a contender for the title of best-selling.

If you're looking for information on specific sales figures, you might find some information on websites like Publishers Weekly or Goodreads, though these will often be limited to specific time periods or countries.