Babies who take a bite of milk and let go and take it again may be caused by physiological reactions, oral pain, respiratory infections, and other reasons. 1. Physiological reaction: As the baby developed an attachment complex to the mother, once in the arms of the mother to eat milk. If you are not hungry, the phenomenon of taking a mouthful of milk and putting it away to eat again will occur. 2. Oral pain: If the baby suffers from oral diseases, such as mouth ulcers, thrush, etc., when eating milk will cause oral pain, so the baby eat a mouthful of put off and eat again. 3. Respiratory tract infection: due to the baby’s respiratory tract infection, nasal congestion, runny nose and other symptoms. When eating milk, the mouth can not breathe normally, so the baby eat milk to eat a mouthful of put off and eat again. If the baby milk eating a mouthful of put off and eat, in the exclusion of physiological reaction, should be timely to the hospital, clear cause and follow the doctor’s instructions for treatment.