From Hurriyet. This is a summary. More details appear in the news article. I did not check the sources, but give them here.
Turkish education union, Eğitim-Sen: In 2015-2016, there are around a million child workers, half of whom are in the agriculture sector.
UNICEF and the Support to Life Association: The southeastern province of Şanlıurfa has the highest number of child workers. In 15 percent of Şanlıurfa families, there is at least one child who is working. Many children face physical violence and abuse at work. Some 15 percent of children in Şanlıurfa who do not attend school work 12 to 14 hours per day.
DİSK-AR: In 2015, children aged 6 to 14 worked 28 hours per week; 15 to 17 worked 45 hours; children who do not go to school worked 54 hour.
Confederation of Progressive Trade Unions’ (DİSK): Child labor increased in provinces like Mardin, Gaziantep, Kilis and Şanlıurfa due to the cheap labor force supplied by Syrian refugees in the agriculture and service sectors.
Worker Health and Work Place Security Council: January 2013-June 2016 report. Over the last 3.5 years, 194 children have lost their lives while working or going to work.
Turkish Statistical Institute (TÜİK) 2013: Among child workers who receive a wage, 3.4 percent had experienced injury; 34 percent faced exhaustion; one-third were not provided with food; 36 percent did not have weekly days off; and 89 percent did not have yearly paid days off.