What complementary foods should be added to a four-month-old baby (Scientific Feeding Guide) When a four-month-old baby’s nutritional needs cannot be met by pure breast milk or formula milk, parents can introduce some complementary foods appropriately. However, unlike adults, babies\’ gastrointestinal and digestive systems are not yet fully developed. Therefore, the method of feeding your baby complementary foods and the selection of ingredients need to be extremely cautious. The following article will introduce in detail what complementary food is the most appropriate choice for a four-month-old baby from four aspects. Boiled water becomes a good friend. Soon after adding complementary food, the baby’s stool