The Administrative Courts of Appeal for Stockholm, Scania and Blekinge say the UN Convention contains too many vague formulations and lacks the precision contained in Swedish law, which is needed to be applied in a uniform and predictable way, reports news agency TT.
The Chancellor of Justice also says that the convention is too unclear to work as Swedish law.
The courts also point out that putting children's rights first and foremost could conflict with other priorities, such as regulated immigration. The administrative court mentions how the convention speaks of children's rights "before and after birth" and that there is no analysis of how the new law could weaken the rights of legal guardians to decide what happens to their children.
The Swedish centre-left government has said it wants to make the UN convention part of Swedish law.
And the incorporation of the convention is welcomed as a "historic" move by the Children's Ombudsman, Fredrik Malmberg, who tells TT that, despite the convention applying for 26 years, there are still serious flaws in the protection of the children most at risk.
Amnesty, child helpline Bris, and the Equality Ombudsman are also in favour of the convention being written into Swedish law.