It may be normal for a 3-month-old baby to have green poop and not take much formula, or it may be caused by indigestion, cold, bacterial infection and other reasons. You can improve your baby’s symptoms by applying hot compresses, massages, sunbathing, and changing to breastfeeding. 1. Normal phenomenon: 3-month-old babies with green poop, if the baby’s mental state is good, the stool is not dilute, do not eat milk powder may have eaten enough, then it is a normal phenomenon, do not need to carry out special treatment. 2. Pathological factors: (1) dyspepsia: if the baby has the performance of bloating, it may be caused by dyspepsia. You can massage the baby’s abdomen clockwise to promote digestion. (2) cold: baby in the cold, intestinal peristalsis accelerated will also have a green stool and do not want to eat the performance of the milk powder. You can use a hot towel to apply warm compresses to the abdomen, and the symptoms will be relieved. (3) bacterial infection: 3 months baby’s immunity is relatively low, easy to be infected by bacteria, thus the symptoms of green stool. At this time, you can take your baby to the sun more often to promote the absorption of calcium, and try to use breastfeeding to enhance your baby’s immunity. It is recommended that if the baby’s symptoms persist without relief, he or she should be examined and treated in a hospital.