It is best to choose iron-fortified rice flour or iron-fortified rice flour for the baby's first complementary food at the age of 6 months, because some trace elements in the baby's body have been almost exhausted during this period. If complementary food is not added in time, enough nutrients and trace elements can not be obtained from breast milk, which will cause abnormal growth and development or affect normal growth and development. Therefore, after adding complementary food for a period of time, you can increase the variety, such as rice porridge, millet porridge, egg yolk, some vegetable puree, fruit puree and so on.