However, the prevalence of underweight children aged 0-6 months increased from 6.9 per cent in 2005 to 8.4 per cent in 2010. In 2014, low birth weight was more common in rural areas (particularly the western region, at 6.6 per cent) than in urban areas (3.8 per cent in Ulaanbaatar). A first list of banned and limited use toxic and hazardous chemicals was approved by the Government in 1997.