Three-month-old babies are less likely to eat less milk, considering that it is related to physiological anorexia, indigestion, thrush, and so on. 1. Physiological anorexia: Most babies begin to experience anorexia at around three months of age, which can be manifested as a decrease in the amount of milk consumed, without any other discomfort. 2. Indigestion: Improper feeding and mental stress can trigger indigestion in babies. Indigestion is often accompanied by crying and restlessness, reduced milk intake, diarrhea or constipation. 3. Thrush: thrush can also cause some of the three-month-old baby to eat less milk, mainly because of the disease caused by the oral mucous membrane damage related to the baby is also easy to accompany the irritability, breastfeeding difficulties and other symptoms. The baby suffers from thrush is mainly related to the decline in immune function, induced Candida overgrowth infection. The three-month-old baby ate less milk, there may 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.