Final answer:
A toddler is in the 'autonomy versus shame and doubt' stage of Erikson's psychosocial theory, focusing on developing independence and self-control.
Step-by-step explanation:
The stage of Erikson's psychosocial theory that a toddler is in is known as autonomy versus shame and doubt. At this stage, typically covering the ages of 1-3 years, toddlers are learning to assert their independence and develop a sense of self-control. They start to show preferences for certain aspects of their environment, including food, toys, and clothing. It is essential for toddlers to be given the opportunity to act on their environment to foster their autonomy, or they may begin to doubt their abilities, which could lead to low self-esteem and feelings of shame. Successful resolution of this stage leads to a budding sense of independence and will, which is a critical part of developing a healthy personality.