Nicholas has done really well with these fish oils. When he was around 2, I started him on this one:
Nordic Naturals Omega 3-6-9 Junior
http://nordicnaturals.com/en/Products/Product_Details/98/?ProdID=1444
Once the bottle was empty, I switched him to this one:
Nordic Naturals Complete Omega 3-6-9
http://nordicnaturals.com/en/Products/Product_Details/98/?ProdID=1435
In looking for a natural Vitamin A and Vitamin D to give Nicholas, I am also now giving him this:
http://www.greenpasture.org/products/cod-liver-oil/1037