Speaking in London, Mr Clegg set out the Liberal Democrat manifesto commitments on childcare, which also includes pledging to boost funding for preschool children from disadvantaged backgrounds and extending free early years education.
Currently, all three and four-year-olds in England, are entitled to 15 free hours of early education a week – an entitlement that is also extended to the poorest two-year-olds.
However, Mr Clegg said that the Liberal Democrats will provide 15 hours a week of free early years education to every family with a two year old.
The speech follows warnings issued by the The Family and Childcare Trust highlighting the rising costs in childcare in recent years.
According to the survey, the cost of sending a toddler to nursery part-time has risen by around a third since 2010, with many parents now forced to spend £6,000 a year on average, while those looking for full-time early years education could pay £11,000 a year.
