I'm not sure about the benefits of fish oil for kids (although my mum used to give me Haliborange tablets as a child, and my spelling's better than most).
As an adult, I now take Omega 3 Pure Fish Oil supplements for the benefits to joints and circulation. Although there are also claims that fish oils are effective in; reducing high blood pressure, reducing inflamation in cases of ulcerative colitis, reducing the risk of breast cancer, reducing breathing difficulties and other problems in asthma patients.
What is there to lose?