Final answer:
In 'Little Women' by Louisa May Alcott, Amy March is the youngest of the four March sisters, which include Meg, Jo, and Beth.
Step-by-step explanation:
The youngest sister in Louisa May Alcott's novel Little Women is Amy March. The March sisters are four in total, with Meg being the eldest, followed by Jo (Josephine), Beth, and finally Amy. Amy is known for her artistic talents and her desire to experience a life of beauty and high society. In the narrative, she matures significantly, transitioning from a somewhat self-centered child to a more responsible and empathetic adult.