No question child labor existed a long time, well before the Industrial Revolution. I'd hope an average day was uneventful and they finished in one piece. At the same time being directly involved with production, did any find and create solutions for safety, quality or output? Causes me to wonder; being around accidents, inefficiency, and conditions overall, was OJT [on job training] utilized to benefit owners or their work-force?
A safe bet would be certain employers saw children as an inexhaustible and very cheap source of labor. Photographic evidence seems to indicate textiles and clothing used children more than others, maybe size was a factor too?