Praise appears to be particularly influential in the critical periods when children develop a stronger sense of identity. When the researchers Joan E. Grusec and Erica Redler praised the character of 5-year-olds, any benefits that may have emerged didn’t have a lasting impact: They may have been too young to internalize moral character as part of a stable sense of self. And by the time children turned 10, the differences between praising character and praising actions vanished: Both were effective. Tying generosity to character appears to matter most around age 8, when children may be starting to crystallize notions of identity.

Praise in response to good behavior may be half the battle, but our responses to bad behavior have consequences, too. When children cause harm, they typically feel one of two moral emotions: shame or guilt. Despite the common belief that these emotions are interchangeable, research led by the psychologist June Price Tangney reveals that they have very different causes and consequences.

Shame is the feeling that I am a bad person, whereas guilt is the feeling that I have done a bad thing. Shame is a negative judgment about the core self, which is devastating: Shame makes children feel small and worthless, and they respond either by lashing out at the target or escaping the situation altogether. In contrast, guilt is a negative judgment about an action, which can be repaired by good behavior. When children feel guilt, they tend to experience remorse and regret, empathize with the person they have harmed, and aim to make it right.

In one study spearheaded by the psychologist Karen Caplovitz Barrett, parents rated their toddlers’ tendencies to experience shame and guilt at home. The toddlers received a rag doll, and the leg fell off while they were playing with it alone. The shame-prone toddlers avoided the researcher and did not volunteer that they broke the doll. The guilt-prone toddlers were more likely to fix the doll, approach the experimenter, and explain what happened. The ashamed toddlers were avoiders; the guilty toddlers were amenders.

If we want our children to care about others, we need to teach them to feel guilt rather than shame when they misbehave. In a review of research on emotions and moral development, the psychologist Nancy Eisenberg suggests that shame emerges when parents express anger, withdraw their love, or try to assert their power through threats of punishment: Children may begin to believe that they are bad people. Fearing this effect, some parents fail to exercise discipline at all, which can hinder the development of strong moral standards.