One month baby stools sour odor not accompanied by fever, diarrhea, abdominal pain, etc., may be related to breast milk, improper feeding, cold and other factors, clear causes can be symptomatic treatment measures. 1, the impact of breast milk: if women in breastfeeding consume too much cold, greasy or spicy stimulating things, irritants into the breast milk, after feeding the baby, may cause the baby intestinal spasm, which affects the formation of stools. Therefore, the mother’s diet should pay attention to hygiene, do not eat too cold and stimulating food, eat less fatty and thick food, so as not to cause the quality of breast milk is not good, affecting the baby’s digestive function; 2, improper feeding: if the baby is drinking milk powder, may be improperly brewed milk powder or do not pay attention to hygiene, and lead to disorders in the baby’s gastrointestinal tract, resulting in slow intestinal peristalsis, fermentation time is too long caused by sour and smelly stools The baby may also have white milk petals in the stool, you can give the baby more warm water, but also to massage the baby’s abdomen to promote intestinal peristalsis, or the application of bifidobacteria and other probiotics to regulate the intestinal tract; 3, cold: when the baby is in the indoor environment temperature is too low, may lead to the baby’s abdomen by cold stimulation for too long, resulting in indigestion, causing gastrointestinal function decline, sour stools. Attention should be paid to abdominal warmth, according to indoor or outdoor temperature changes to increase or decrease clothing, so as not to cause disease.