By Lindsay Fisher

A three-year-old found out she'll soon be the proud owner of a "Big Sis" shirt. Her reaction was more on the stinky side than the excited side. 

Her dad delivered the news to Katherine. You'd think the pint-sized future sibling would be relishing the idea to fight with someone for life. However, she was more concerned about the gas she just passed. 

Check out her reaction here.