One-and-a-half-year-old babies can add complementary food. Oat granules are pasty, flat and sweet, and have the effects of invigorating stomach and spleen, moistening intestines and relaxing bowels. You can eat it as early as 4-6 months old, so don't worry too much. The types of complementary food for infants can be diversified, but they should not eat too much.