Final answer:
Separation anxiety in infants indicates that they now recognize who does and does not belong in their social world, leading to the development of attachments with their caregivers.
Step-by-step explanation:
Separation anxiety that infants show around the same time they begin to crawl indicates that they now recognize who does and does not belong in their social world.
This recognition is an important milestone in their development and helps them form attachments with their caregivers. Separation anxiety is a normal part of the attachment process and typically occurs as infants become more aware of their surroundings and develop a sense of object permanence.