Children gradually acquire five concepts for understanding and coping with death: Irreversibility (permanence of death), individuals’ death (death comes even to the individual himself/herself), universality (death is unavoidable), inoperability (cutting off all life functions), and causality (understanding the causes of death) (
8,
9). Causality refers to knowing the cause of death. The development of the understanding of the cause of death occurs during the following stages: In stage one (2 - 3 years), children often have many questions about cemeteries, caskets, and funerals. However, for them, death is still considered a temporary phenomenon. The second stage (5 - 9 years) is when children pass from Piaget's pre-operational stage to the concrete operational stage (
10) to recognize that death is an irreversible phenomenon (
2). At this age, due to the presence of magical thinking, the child may think that their thinking and actions caused the death of their loved one, making them feel guilty (
11). The third stage (+9 years) is when an individual perceives death as a personal, final, inevitable, and universal phenomenon (
2). However, the individual still thinks that only very old and weak people die. At the age of adolescence, death is accepted as a natural process, but it is perceived as too far away, and it is not easy to accept that any accident may lead to death; this is why high-risk behaviors are often observed in adolescents (
11). An accurate understanding of death usually develops at 9 to 11 years of age, although brain maturation and higher-order cognitive functioning continue to develop during adolescence and early adulthood (
9). Finally, with the child's further development, his/her coping mechanisms become more effective and operational (
12). Nevertheless, since grief occurs during development, there is always a part of the grieving process that may need to be resolved in the future (
10). Black summarizes children's levels of perception of death and the symptoms of complicated grief as shown in
Table 1 (
1).