Guidelines for complementary foods necessary for the healthy growth of one-and-a-half-year-old babies. When the baby is about one-and-a-half years old, breast milk or infant formula can no longer meet the nutrients needed for the baby\’s physical development. At this time, the appropriate introduction of complementary foods is one of the necessary measures to promote the healthy growth of the baby. Below, we will provide parents with a detailed explanation of the complementary food guidelines necessary for the healthy growth of one-and-a-half-year-old babies from the aspects of their children\’s nutritional needs, principles that should be followed, suitable food materials and preparation methods. 1. Baby’s Nutritional Needs When a baby is about one and a half years old, its deciduous teeth have grown, and its swallowing ability has also increased. At this time, babies need diverse and adequate nutrition