Break times and lunch times must be staggered in schools, new guidance from the Department for Education says.
Class sizes should be kept as small as possible and parents should not gather at the school gates when dropping off and collecting children, according to official advice.
Schools in England officially closed on Friday, but have remained open for vulnerable youngsters and children whose parents are key workers, such as medics, police and delivery drivers.
The new guidance, published on Tuesday night, acknowledges that as social distancing measures will be “harder” to implement among young children. By staggering lunch times, break times and any movement of pupils around the school, the chance of large groups of children gathering will be reduced, the advice says.
Children, parents, carers or any visitors, such as suppliers, should not visit the educational setting if they are displaying symptoms of Covid-19, while unnecessary travel on coaches, buses or public transport should be reduced.
Guidelines ask all staff and children to frequently wash their hands for 20 seconds, while surfaces in classrooms, including desks and handles, should be cleaned more often.
Although children are likely to become infected at the same rate as adults, the Government said the infection is usually mild. In most cases among children and staff it will not cause serious illness, the guidance added.
Should any education and childcare settings face additional costs as a result of the coronavirus crisis, the department says it will put a new process in place to reimburse schools for exceptional costs.
Gavin Williamson, the education secretary, said: “In order to help keep them and their pupils safe, we have issued tailored guidance for schools and education settings on social distancing and other hygiene measures. It offers practical advice to schools, like staggering break times and the movement of pupils around schools.
“We will provide further guidance for special settings, and continue to work with the sector to ensure schools get all the support they need.”