Babies suddenly cry when they drink milk, which is related to various factors such as insufficient milk, thrush, indigestion and so on. 1. Insufficient milk, if the milk is insufficient, the baby can’t get enough milk during the drinking process, which may cause the baby to be too irritable, and thus the symptom of sudden crying will appear. 2. Thrush, if thrush occurs, there are more blisters in the mouth, the baby may be irritated when drinking milk, resulting in pain, so the symptoms of sudden crying. 3. Indigestion, if the baby has indigestion, increased gas in the intestines, drinking milk when the digestive tract discomfort may appear this symptom. The baby suddenly cried when drinking milk, there may also be other reasons, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.