During which developmental stage do children typically start to express independence, often saying "no" frequently?

Children typically start to express independence during the toddlerhood stage, which generally encompasses ages 1 to 3. This period is characterized by significant physical, cognitive, and social development. As toddlers begin to explore their environment more actively, they also develop a sense of autonomy and self-identity. This newfound independence leads them to assert their preferences, often resulting in the frequent use of the word "no" as they test boundaries and communicate their desires or refusals.

At this stage, toddlers become more aware of their ability to make choices, which is an important aspect of their development. This assertion of will is a normal part of growing up, as they learn to navigate their social world, interact with caregivers, and establish their likes and dislikes. The behavior can also be seen as a way of exerting control over their surroundings, which is crucial for their self-development. Thus, toddlerhood is marked by this important developmental milestone where children begin to explore independence, making the identification of this stage as correct.