That’s not an alarming word count. Middle grade fiction typically falls between 25,000 – 45,000 words, leaning toward the smaller end of the spectrum more often than not. But there are no set numbers. Consider this: Karen Cushman’s The Midwife’s Apprentice is a slim one at 22,000 words (about 122 printed pages, depending on the edition in your hand). Christopher Paul Curtis’s Bud, Not Buddy, comes in at about 52,000 words (245 book pages, again depending on how your edition has been designed). There you have it, two Newbery Medal books that show the word count spectrum can be stretched either way for great stories.
The EditorP.S. For more on this topic, read Formatting/Punctuation, Submissions, Teen/Middle Grade Fiction