स्वाभाविक रूप से स्वस्थ और सक्रिय बच्चे आंतरिक रूप से कैसे होते हैं?

According to Piaget, the stage in which children develop object permanence is:

Kohlberg's highest stage of moral development is characterized by:

Which of the following behaviors in early childhood would MOST strongly indicate a need for developmental screening for Intellectual and Developmental Disabilities (IDD)?