Should I be concerned about my son's behavior of pulling his shirt constantly?

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This seems to be an attention seeking behavior by your child. It occurs in those families where both parents are working. If your child does not have any other symptoms like convulsions, altered sensorium and delayed milestones, then there is probably no brain involvement. If this behavior of the child continues or increases in nature, then you might have to visit a child psychiatrist. Till then, spend more time with the child. Make sure that he is not getting any problems at school. If so, help him out with his problems. Tender loving care of such children usually results in subsiding of these symptoms over a certain period of time. If not, then please see a child psychiatrist.