On Kate's first birthday, Arthur remembers when his mother first told him and D.W. that she is pregnant. Arthur is nervous, wondering what it will be like to have a new baby in the house. When Kate is born, Arthur is worried that she hates him, since she cries whenever he is nearby. Following the events of the previous episode, Kate finally displays her affection for Arthur. D.W. feels jealous of the attention Kate is receiving from the rest of the family and tries anything to get rid of her, but nothing works.