BookList -- You can limit searches to "books for youth," but need to register (free) to read the whole review.
Horn Book - Reviews of Children's books via Horn Book magazine,
Kirkus Reviews - You can limit to Children's and Teen books.
School Library Journal - This site reviews only Children's and Young adult books.
VOYA - Reviews of Children's and Young Adult books from VOYA Magazine.
Newberry - The John Newbery Medal is a literary award given by the American Library Association to the author of "the most distinguished contribution to American literature for children.
Caldecott - The Randolph Caldecott Medal annually recognizes the preceding year's "most distinguished American picture book for children", beginning with 1937 publications.
Children's Literature Collection LibGuide This is a guide created by Sylvia Tag, Librarian for Children's Literature
Top 10 most Challenged Books according to the American Library Association (ALA), by year, with reasons.
100 most frequently Challenged Books by decade this list pertains to the US only, and is hosted by ALA
List of Books Banned by Governments (Wikipedia). This is a fascinating and frightening list.