When a 3-month-old baby does not eat milk, the cause should first be clearly identified and then treated and regulated according to the cause. Common causes mainly include physiological anorexia, indigestion, zinc deficiency, etc., which can be treated by general and medication. 1. Physiological anorexia: Physiological anorexia is a relatively common transition period for infants and is a normal phenomenon. There is no need for special treatment. Parents can change the way of feeding, for example, by feeding a small number of meals, and then feeding the child when he is hungry or tired of playing. When the child is breastfeeding, attention should be paid to creating a good environment for breastfeeding, keeping the surrounding environment quiet, avoiding interference with the child’s attention to breastfeeding. 2. indigestion: if it is due to indigestion, resulting in abdominal distension and discomfort caused by the 3-month-old baby does not eat milk, can be appropriate to rub the abdomen, promote gastrointestinal peristalsis, promote the digestion and absorption of food as soon as possible. If necessary, the doctor can guide the application of probiotics (bacillus subtilis bifidus) and other treatment. 3. Zinc deficiency: If a zinc deficiency causes a 3-month-old baby not to eat milk, after a clear diagnosis, you can follow the doctor’s instructions to apply zinc gluconate and other zinc supplements. It is beneficial to replenish the zinc element needed by the baby’s body and improve the phenomenon of not eating milk. 3 months of the baby does not eat milk, parents should remember to blindly give the child medication, it is recommended to seek medical advice as soon as possible, by the doctor’s guidance reasonable application of relevant drugs to regulate.