Burma has been reported as one of the worst offenders in the use of child soldiers. Some background on Burma from a recent BBC article, citing the new report by the Coalition Against the Use of Child Soldiers:
Burma has been named as the most persistent user of child soldiers, with thousands in its armed forces – some as young as 11…
The Burmese military is involved in conflicts with several ethnic groups in border areas. Evidence of the use of child soldiers has also been found in armed groups both allied to and opposed to the army.
And quoted directly from the 2008 report:
Thousands of children continued to be recruited and used in the Tatmadaw Kyi (army) and in armed political groups, as the army continued its expansion drive and internal armed conflict persisted in some areas of the country. Although the government took some steps to address the issue, a formal disarmament, demobilization and reintegration (DDR) program was not in place.