One and a half year old babies can drink pure milk in moderation, but it is recommended to try to drink formula milk first and gradually switch to pure milk. The specific situation should be analyzed in conjunction with the individual situation. One and a half year old children gastrointestinal digestive function development is not yet very strong, can drink pure milk, but still recommended to infant formula-based. Due to individual differences, not all one and a half year old children can not drink pure milk, need to analyze the specific problem. If the child does not like to drink formula, you can try a small amount of pure milk, if there is no diarrhea, constipation, indigestion and other symptoms of discomfort, you can gradually increase the amount of pure milk. In addition, if a one and a half year old child is allergic to milk, or gastrointestinal function is weak, weight gain is not ideal for malnutrition, it is recommended that formula feeding, do not simply drink pure milk. One and a half year old baby in the milk at the same time, to add appropriate complementary foods, pay attention to the balance of nutrition and so on.