The following databases are good places to search for book reviews of children's and YA books published in both scholarly journals and popular magazines.
H.W. Wilson Core Collections are annotated lists of recommended books for different age groups, including reviews when available. See EBSCO's Use Cases for the Core Collection databases for tips on how to search for and use the content. Core Collection databases relevant to children's literature include:
NoveList Plus is a readers advisory database of fiction and nonfiction for adults, teens and children, offering enhanced subject access and full-text reviews, Author Read-alikes, awards, theme-oriented book lists, Book Discussion Guides, Book Talks, and Feature Articles for a wide range of reading interests.
NoveList Plus is available to UW students through the Seattle Public Library by using an SPL library barcode and PIN number (all UW students are eligible for SPL library cards).