Srabani Sen from Every Disabled Child Matters says she is concerned the improvements being made to special educational needs funding will be overshadowed by the Government's wider policies.
The reforms will see education, health and social services forced by law to work together to provide support for children with special educational needs (SEN).
The proposals were first laid out in a Green Paper in March last year, amid concerns the current system for SEN children is too complex, and often leaves parents fighting for help.
In some cases, disabled children have had to undergo operations to correct growth problems caused by a system that has left them waiting months for a new wheelchair.
Parents are to be given new rights to buy help for children with special needs under the biggest shake-up of the system for 30 years, childrens minister Sarah Teather has confirmed.
ITV News reporter Sally Biddulph reports:
Parents are to be given new rights to buy help for children with special needs under the biggest shake-up of the system for 30 years, it was confirmed today.
Under the plans, families will be given legal powers to control budgets for youngsters who need support.
Ministers are pressing ahead with the proposals in a bid to make it easier for parents to get their child help, without being passed between agencies.