Among the following, which is a response to trauma specific to infants?

The response to trauma that is specific to infants is attachment disorder. Infants who experience trauma, such as abuse or neglect, may have difficulties forming secure attachments with their primary caregivers. This can lead to attachment disorders, which are characterized by problems in emotional and behavioral development. For example, an infant may exhibit signs of anxiety or avoidance in relationships, indicating disruption in the normal bonding process.

In the context of child development, secure attachment is crucial as it influences a child's emotional regulation, social competence, and overall well-being. The disturbances caused by trauma can hinder the ability of infants to develop these secure attachments, resulting in long-term consequences for their social and emotional health.

Other choices such as school engagement, weight gain, and positive peer relationships are more relevant to older children and adolescents and do not specifically address the unique developmental needs and responses to trauma in infants.