It is normal for very young children between the ages of 7 and 15 months old to experience separation anxiety. Often times kids go through a phase when they are scared nervous of unfamiliar people and places. Anytime a child has the fear it can be excessive and if it last longer than four weeks the child may have separation anxiety disorder. Separation anxiety disorder is a condition in which a child becomes alarmed or frightened when away from home or separated from a parent or love one. This fear may interfere with the child’s normal activities, such as going to school or playing with other children.