The government has suffered a defeat in the House of Lords over its plan to double the amount of free childcare for parents of three and four-year-olds.
Labour and Liberal Democrat peers voted 222 to 209, majority 13, for the change not to come into force until a full analysis of funding the policy has been carried out.
In August, nurseries warned that the Conservative's pre-election pledge to raise free childcare from 15 to 30 hours for 38 weeks a year would cost providers and are unworkable.
Complaining abut a lack of detail in the Bill, Baroness Jones of Whitchurch said: "There are real questions about how these new places are to be funded and what will happen if they aren't fully funded."
She said the plan wasn't viable without a considerable injection of cash and demanded a review of the funding system before the Bill became law.