Separation anxiety is a normal part of childhood development. It occurs in babies between 8 and 12 months old. It usually disappears around age of 2.
Some children have symptoms of separation anxiety during their grade school and teenage years. This condition is called separation anxiety disorder or SAD. Three to four percent of children suffer from this condition. SAD tends to be indicative of general mood and mental health issues: Around one-third of children with SAD will be diagnosed with mental illness as an adult.