Julius, the Baby of the World by Kevin Henkes

Kevin Henkes' lovable and familiar character, Lilly, gets a new sibling. As she journeys through sibling rivalry and disgust of her little brother, Julius, she finds out how special he really is.

Source: http://baby.about.com/od/babysfamilymembers/ig/Best-Sibling-Books/Julius--the-Baby-of-the-World.htm

Natasha Isabelle Anna Cydney Caley Leigh