Yurchik, the smallest member of the family, tries to be bigger by climbing on things. He learns that he becomes bigger by doing something "big", not by being taller. It is very difficult to be the youngest, littlest one in the family. Yurchik's sister and brother are too old to play with him now; they prefer to do other things. And his parents are too busy. His companion is just a puppy, a little dog named Klapovukh.