There was a UNICEF report that placed the figure at 500,000 children and somewhere in excess of 1,000,000 adults that had died as a result of the sanctions. Unfortunately, the report had been taken down last time I checked, and I hadn't saved a copy on my machine, so I can't offer a link. Here's a summary that estimates half a million children under age 5, though the link to the report is broken:
http://www.unicef.org/newsline/99pr29.htm
The issue was that dual use items were banned even if one of the uses was legitimate. In particular, many medical supplies were prohibited by the sanctions because they could also be used for biological weapons programs. There was also the whole issue of inadequate food.
Violence is not the only way to kill innocent people.