Separation anxiety is most noticeable in early childhood, when children are between the ages of 1 and 3 years old. At this age, children spend more time with their parents and their brain development matures, so they may experience significant anxiety after being separated from their mother or father. Especially in the early years of kindergarten, children who have been with their parents for a long time suddenly become insecure and tense after being separated from their parents. This situation will be alleviated as the child gradually adapts to kindergarten life. Parents should also pay attention to their own emotions, and most children can overcome separation anxiety.