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 Red stripe 5th mon- Yellow belt + 2 Red stripes 6th mon- Yellow belt + 3 Red stripes 7th mon- Orange belt + 1 Red stripe 8th mon- Orange belt + 2 Red stripes 9th mon- Orange belt + 3 Red stripes 10th mon- Green belt + 1 Red stripe 11th mon- Green belt + 2 Red stripes 12th mon- Green belt + 3 Red stripes 13th mon- Blue belt + 1 Red stripe 14th mon- Blue belt + 2 Red stripes 15th mon- Blue belt + 3 Red stripes 16th mon- Brown belt + 1 Red stripe 17th mon- Brown belt + 2 Red stripes 18th mon- Brown belt + 3 Red stripes