New Jersey's American Civil Liberty Union and other groups are seeking to ban solitary confinement of juveniles held in state custody.
The groups say there is a growing body of research that shows the practice is harmful to children.
The ACLU plans to petition the state on Monday to change rules for juvenile detention centers to ban the disciplinary measure.
Currently, juveniles can be on the restriction up to 10 days per month as punishment for bad behavior in the detention center.
In its petition, the ACLU says five states now ban solitary confinement for juveniles and three have strict limits on it.
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