Three, four to six months baby complementary food add points? 1. You should feed them one by one at the beginning, with one to two weeks between each kind of food. 2. When feeding sample by sample, each time a small amount, from a spoonful to two to three tablespoons to half a bowl of rice, etc. 3. Dairy products are the main food for your baby, and you must ensure a daily milk intake of 600-800ml.