9 February 2016 Last updated at 09:39 GMT
One in five children will experience mental health problems before they are 11 - but only a third of schools have an on-site counsellor, suggests research by the charity Place2Be and National Association of Head Teachers.
Children at Highfields Primary School have regular counsellors, one of them, Mandy, seems to be making a difference.
If left untreated, young children's mental health problems could spiral in adulthood, warns a report.