Children Should Start School 'From Age Of Two'
Early years education is often not good enough for many poorer children, according to the head of Ofsted.
Sir Michael Wilshaw said the attainment gap between children from disadvantaged backgrounds and their more "prosperous peers" is "large" by the time they start school.
In Ofsted's first Early Years Annual Report he is expected to call for more nursery education to be carried out in schools.
Speaking at a nursery in Windrush Primary School in Greenwich, Sir Michael said poorer children did particularly badly in early years settings, often lagging two or three years behind other children.
"They do better in school-based provision - in schools like this with a discrete early years setting which teaches them the skills they need to start school," said the Ofsted head.
"We're saying we're going to be a lot tougher on early years settings that don't teach children these basic skills and we're urging the Government to put more early years provision into schools."
Sir Michael is also expected to argue that children should be enrolled in school as young as two years old.
Wendy Ellyatt, from the Save Childhood Movement, told Sky News it is not necessarily the answer.
"The needs of two-year-olds are profoundly different to children who are older," said Ms Ellyatt.
"They need space to move and develop their physiology as well as neurology.
"You can't just say schools for two-year-olds isn't a bad idea - what we're saying is whatever environment you put a two-year-old in is environmentally appropriate.
"What's right for one child won't be right for another, so we can't have a 'one size fits all' approach to people at this very sensitive age."
Sir Michael warned that too many early years education providers are failing to teach youngsters "social, emotional and learning skills".
He said Ofsted would toughen the inspections of providers and take action against those that do not adequately prepare children for academic life.
"We're asking HM inspectors to focus on early years more than ever before," said Sir Michael.
"Our concern is those skills are not being adequately taught - and we will recommend de-registration of those providers who are not doing both."