One criticism of Piaget's work is that he:

Piaget's research primarily focused on the stages of cognitive development in children, leading to the conclusion that they think in fundamentally different ways from adults. One significant criticism is that he may have underestimated children's abilities, particularly in regard to their capacity for understanding and reasoning at younger ages than he proposed.

Research has shown that children can demonstrate more advanced thinking skills than Piaget's stages suggest. For instance, tasks that he believed were too complex for younger children have been shown to be solvable when presented in a familiar context or through engaging and interactive methods. This has led to an understanding that children's cognitive skills may develop more rapidly or be more advanced than Piaget originally indicated, prompting the need to reassess the age at which certain cognitive abilities emerge.

By acknowledging this underestimation, it highlights the evolving nature of our understanding of child development and suggests that cognitive abilities may be more nuanced compared to what Piaget articulated in his theory.