All kids experience some separation anxiety. For infants and toddlers it is a normal stage of development that's connected to developing an attachment to parents and other caregivers. In older children, certain separation fears and worries are typical for their age. For example, let’s say your child is starting his first day of kindergarten. He is likely to show some anxiety and discomfort when getting up and ready for school and going into the school for the first time. He may even cry when he comes home and say he wants to stay home and not return to school. If this period of anxiety is minor (he is comforted by reassurance), lasts only a few days, and is replaced by a return to his normal mood and activities, this is probably normal separation anxiety. However, if your child remains significantly distressed about being away from you during the school day (to the point where he is physically ill, can’t focus, isn’t soothed, and is disrupted in other activities), this may be separation anxiety disorder.