A colorful and fun Introduction to Your New Baby Brother. In Hello, Baby brother! a four-year-old rabbit embarks on the unfamiliar journey of becoming an older sibling in best-selling author-illustrator Martha Day Zschock's Hello! board book series for children. In Hello, Baby Brother, join the rabbit in discovering how to hold, feed, and sing lullabies to a baby sibling. Along the way, the older sibling learns about sharing an old crib, toys, and even Mommy and Daddy! The best lesson of all, though, is love. For ages 2-5. 6.4 oz. Author: Martha Zschock. Format: board book. Series: hello.