What are some of the most common causes for childhood injuries?

Hui Qun did a good job of listing out a comprehensive list of things that cause injuries, so I won't add anything here. According to KKH, 60% of childhood injuries are actually sustained at home - so your home is probably the first place to secure. This article is a great place to start: http://sg.theasianparent.com/how-to-childproof-your-home/