It is not unusual for a very young child to think of death as something that is reversible.

Question

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Very young children (around ages 3-5) may not fully understand the finality of death and may believe that it is a reversible process. They may think that death is temporary and that people or animals who have died will come back to life. This is a normal part of cognitive development and usually changes as the child grows older and learns more about the concept of death.

It Is Not Unusual for a Very Young Child to Think