Four-month-old babies who are hungry quickly are mostly considered to be caused by not having enough to eat. Four-month-old babies usually take milk once every four hours or so, if the child does not drink enough milk for a certain amount of a meal, then it is likely to cause the child to be hungry quickly, and it is recommended that parents usually give their babies enough milk to drink. Parents are generally through the baby crying to determine whether it is hungry, but if the baby crying obviously does not match the usual eating pattern, should first rule out non-hunger reasons, such as gastrointestinal discomfort. Non-hunger causes of crying, increase the number of feedings can only ease the baby’s anxiety, and can not solve the root of the problem, should seek medical attention to clarify the cause of the disease.