If you are breastfeeding, and you are taking adequate supplements, you do not need to give your baby additional supplements.

If you are formula feeding, you can give the baby the cod liver oil, but be sure that it is free of contaminents and is as pure as you can buy...there is a danger of mercury poisoning if you don't.
Cod liver oil will provide vitamin D, vitamin A, and the omega-3 fats that stimulate brain development. Give one teaspoon for each 50 pounds of weight. A baby that weighs 10 pounds should get ¼ teaspoon, and a baby that weighs 20 pounds should get a little less than ½ teaspoon per day in the winter months. Use a source of cod liver oil that has been tested for contaminants (such as Carlson's brand). In the late spring through early autumn, give 100 mg of the omega-3 fat DHA from algae (Neuromins) or a fish oil supplement without vitamin D to babies who are eating solids. Babies that are solely breastfed do not need additional DHA if their mothers have an adequate intake of omega-3 fats, such as a fish oil or cod liver oil supplement. Breast milk normally has high levels of DHA, which can be increased by taking an omega-3 supplement.

Thanx a lot mominashoe.