Final answer:
A child's developmental hierarchy of fear depends on their chronological age and their stage of cognitive development. Babies may exhibit stranger anxiety when they are unable to assimilate a stranger into their existing schema. Specific life events can also influence a child's fear.
Step-by-step explanation:
The child's developmental hierarchy of fear depends on their chronological age and their stage of cognitive development. Babies may exhibit stranger anxiety, which is a fear of unfamiliar people, at around the same time they develop object permanence. This fear arises because the child is unable to assimilate the stranger into their existing schema. Furthermore, a child's fear can also be influenced by the presence of specific life events, such as traumatic experiences or major changes in their environment.