Many children experience separation anxiety between 18 months and 3 years, when it is normal to feel some anxiety when a parent leaves the room or goes out of sight. It's also common for a child to cry when first being left at daycare or preschool. If a child is older and unable to leave a family member or takes longer to calm down after separation than other children, then the problem could be a separation anxiety disorder. Other symptoms include refusing to go to school, camp, or a sleepover. This disorder is most common in kids ages 7 to 9 and affects about 4 percent of children.
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