This animated series is based on Marc Brown's best-selling books about Arthur Read, an eight-year-old aardvark, his sister D.W., and their f amily and friends. D.W. and Arthur think back to before their sister K ate arrived. Arthur remembers his trepidation about getting a new sist er in "Arthur's Baby." D.W. remembers how Kate changed her life after she arrived in "D.W.'s Baby."