Babies who are exclusively breastfed can gradually add complementary foods from 4 to 6 months of age. If the amount of breast milk is sufficient, you can gradually add complementary foods at 6 months, and add complementary foods can first add iron-fortified rice flour. To add complementary foods, you need to feed one kind of food first and observe your child’s reaction after eating so that he can gradually adapt to it before adding another kind of food. It usually takes 7-10 days for a new food to fully adapt to the child. When adding complementary foods, you should pay attention to gradually adding from small amount to large amount, it is not recommended to add multiple complementary foods at the same time, but should add each complementary food gradually. The first food to be added should be pureed food, then semi-solid food, and as the baby grows older and teeth erupt, the baby can gradually transition to solid food.