Primary schoolchildren spoilt by their parents can cause disruption in the classroom by repeating manipulative behaviour used at home, a report says.
Research for the National Union of Teachers (NUT) suggested a minority of children threw tantrums, swore and were physically aggressive.
NUT boss Steve Sinnott is calling for more advice for parents who struggle to say “no” to their children.
The government says it recognises parents want more support.
Cambridge University held 60 interviews with staff and pupils in 10 schools.