What kind of complementary foods can a six-month-old baby eat? Six months is when the baby starts to be exposed to complementary foods. How to match nutritionally balanced complementary foods to the baby? The following are four aspects that nutritionists will explain to you in detail: 1. What kind of complementary food can be given to a six-month-old baby? Six-month-old babies begin to enter a critical period of growth and development. When choosing complementary foods, the first choice should be those with small particles, easy to chew, and easy to digest, such as rice soup, rice cereal, noodle paste, etc.