Almost two million schoolchildren are behind their peers in talking and understanding words, the highest level on record.
Experts blamed the impact of the Covid-19 pandemic on children’s social development and communication skills. The increasing use of tablets and television to entertain youngsters is also feared to have played a role.
The “unprecedented” jump in children needing speech and language therapy has left thousands waiting more than a year for care.
NHS services say a lack of capacity means they are being forced to concentrate on those with the most severe needs, but warned it was likely to impact both “wellbeing and outcomes” for those waiting longer.