At what age is separation anxiety a common problem?

A) School-aged children
B) Preschoolers
C) Middle infancy
D) Newborns

Separation anxiety is most common from middle infancy throughout the toddler years,especially from ages 16 to 30 months.Preschoolers are better able to tolerate brief periods of separation,but their protest behaviors are more subtle than those of younger children (e.g. ,refusal to eat,difficulty sleeping,withdrawing from others).School-aged children are able to cope with separation but have an increased need for parental security and guidance.