Kids have a way of finding interest in the ickiest things. You don't want to end the fun playtime to put your child in the bath after they've found an unpleasant remain. Also, keep sandboxes covered so cats do not use them as a litter box. According to the US Consumer Product Safety Commission an estimated 51,000 children are treated in US hospital emergency rooms for backyard playground equipment-related injuries. About 15 children die each year as the result of playground equipment incidents.
Most injuries are the result of falls.
Be sure that your playground equipment is in good condition. Check for sharp edges or hot surfaces, that it's still secured in the ground, and has protective covering under it that is thick enough and wide enough to prevent injury should a child fall. The Consumer Product Safety Commission has a wide range of recommendations based on the height of the equipment and the type of protective layering you're using. You can get complete details in the CPSC's Handbook for Public Playground Safety. Other playground equipment hazards which can cause strangulation include ropes, hats, and strings on clothing.