The normal physiological phenomenon of a baby’s green stools may be due to milk transfer, but it may also be caused by fatty indigestion, abdominal cold, and so on. 1. Normal phenomenon: bilirubin in the role of intestinal flora during the transfer of milk will undergo a chemical reaction, transformed into bilirubin, stools will show green. Usually, there is no abnormal change in the character and frequency of stools, and it does not affect the baby’s eating, and the symptoms can disappear after a few days of adaptation. 2. Fatty dyspepsia: babies usually have imperfect digestive function, if the milk powder contains more fat after switching to milk, fatty dyspepsia may occur, the bile that is not emulsified into biliverdin may appear green stools, usually oily in color, soft texture, easy to stick to the toilet bowl. 3. abdominal cold: during the milk transfer baby stomach cold, gastrointestinal tract peristalsis accelerated, the food is not fully digested and absorbed, as well as part of the bile out of the body, there may be green stools. The baby during the milk transfer green stools exclude the normal nature of the stools, the number of physiological reasons, but also may be the use of iron is incomplete, improper transfer of milk and other reasons, should be timely consultation, under the guidance of the doctor to carry out reasonable treatment, so as to avoid delay in the treatment.