The one by GNC is really good. It tastes like strawberry apparently, which is great for kids (personally for me too, I hate the taste of original cod liver oil). Maybe you can give that a try? It's formulated for kids and with a fruity taste, I think it will be just right for your child :)
Only downside, it's a wee bit pricey -- nearly 56SGD for a 230ml.
Chengling Tan