There is no regulation on what complementary food a five-month-old baby should eat, but it is usually recommended that a five-month-old baby should be fed mainly with breast milk or formula milk, and then complementary foods, such as rice flour, pureed fruits and vegetable juices, should be added when the baby reaches six months of age. In general, five-month-old babies gastrointestinal digestive system as well as the immune system and other development is not perfect, the diet is usually still breast milk or formula-based, too early to add complementary foods, may increase the risk of allergies, diarrhea and so on. When the baby 6 months or so, its digestive system development is further improved, you can discretionary trial to add some complementary foods, such as iron fortification rice powder, fruit puree, vegetable puree and so on. But pay attention to the baby to add complementary foods should be gradual and orderly, the amount of a complementary food should not be added too much, the types of food should not be too mixed, etc., if there is any discomfort, immediately stop adding, and if necessary, consult a doctor in a timely manner.