“Worryingly high” levels of violence remain at a young offender institution in Staffordshire that was the most violent in England and Wales.
HMYOI Werrington was still struggling to manage behaviour and provide a purposeful regime for children, a September visit by inspectors found.
In January inspectors said it had the highest number of assaults among children at any youth jail.
The government said it was working hard to address the concerns highlighted.
The facility near Stoke-on-Trent can hold up to 118 boys under the age of 18 and at the time when HM Inspectorate of Prisons visited, there were 55 children in residence.