Scores of children, parents and MPs marched to Downing Street today to oppose the government's plans to test four-year-olds within weeks of them starting school.
The so-called baseline assessments are expected to start this autumn.
It will see teachers put numeracy, literacy and language questions to four-year-olds over a period of 20 minutes.
Protesters, including under-fives and families from the South, are urging the government to reverse its plans.
They handed in a petition to Downing Street signed by more than 65,000 people.
Some parents have questioned proposals to test four-year-olds within the first two months of school.
One mother from Brighton described the plan as "an absolute nonsense"
However the Government insists the assessments are about holding schools to account "in a fairer way" on how they measure children's progress.
A pilot of the Department for Education's plans is due to commence in September.
It will run in a number of schools in parts of England before being rolled out across the country in 2020.
Children's answers are expected to be recorded by teachers onto a electronic tablet.
Schools will be unable see the data as it will be sent to the DfE.
They will then compare it to results from the same children seven years later.