Bulwell MP Graham Allen MP this week voted in Parliament in a bid to reduce class sizes for infants.
The MP said: “Reducing the number of infants in each class was one of the best achievements of the previous government.
“Then in 2012, David Cameron’s government relaxed the rules on infant class sizes.
“It was easy to sell this as deregulation and cutting red tape.
“As a result the number of infants taught in large classes of over-30 has spiralled.
“On current trends, another five years of these priorities in planning for school places could lead to babies born this year being the one in four infants who are taught in class sizes of over 30 by 2020.”
According to Mr Allen, in Nottingham, the number of primary school pupils in classes over 30 has increased by 400 per cent since the changes.