Reactive attachment disorder usually starts in infancy. There's little research on signs and symptoms of reactive attachment disorder beyond early childhood, and it remains uncertain whether it occurs in children older than 5 years. Signs and symptoms may include: 
Unexplained withdrawal, fear, sadness or irritability
Sad and listless appearance
Not seeking comfort or showing no response when comfort is given
Failure to smile
Watching others closely but not engaging in social interaction
Failure to reach out when picked up
No interest in playing peekaboo or other interactive games
Behavior problems
Failing to seek support or assistance
