The government is delaying reforms to the Special Educational Needs and Disabilities (Send) system and other policy proposals for schools in England until next year.
It originally planned to publish its Schools White paper, which includes plans for Send, this autumn.
But Education Secretary Bridget Phillipson said there would be a "further period of co-creation, testing our proposals with the people who matter most in this reform".
The Disabled Children's Partnership said the delay was "deeply frustrating for parents" but added it was "important that the government takes time to make the right decisions". The County Councils Network called it "massively disappointing".