Junior Judoka are graded through Mon grades (unlike adults who are graded through Kyu grades). At a junior level the highest grade you can achieve is 18th Mon (Brown belt) where upon you must wait until you are 16 years of age till you can grade towards your 1st Dan (Black belt). At this stage you will enter the adult grading scheme.
The Belt system goes as follows: 1st mon - Red belt + 1 yellow stripe 2nd mon - Red belt + 2 yellow stripes 3rd mon- Red belt + 3 yellow stripes 4th mon- Yellow belt + 1 yellow stripe 5th mon- Yellow belt + 2 yellow stripes 6th mon- Yellow belt + 3 yellow stripes 7th mon- Orange belt + 1 yellow stripe 8th mon- Orange belt + 2 yellow stripes 9th mon- Orange belt + 3 yellow stripes 10th mon- Green belt + 1 yellow stripe 11th mon- Green belt + 2 yellow stripes 12th mon- Green belt + 3 yellow stripes 13th mon- Blue belt + 1 yellow stripe 14th mon- Blue belt + 2 yellow stripes 15th mon- Blue belt + 3 yellow stripes 16th mon- Brown belt + 1 yellow stripe 17th mon- Brown belt + 2 yellow stripes 18th mon- Brown belt + 3 yellow stripes