Egg-shaped stools in four-month-old infants after breastfeeding or cow’s milk may be caused by intestinal infections, which should be treated with dietary adjustments, prevention of dehydration, antibiotic therapy, intestinal mucosal protectants, and zinc supplementation. Four-month-old babies with egg-shaped stools may be acute heavy diarrhea disease, which is mostly caused by intestinal infections, low appetite, often with vomiting, stools of yellow watery or egg-shaped. Due to diarrhea, eating and absorption is reduced, intestinal mucosal injury needs to recover, invasive enteritis loss of protein, etc., should continue to eat. At the same time should be based on individual digestion and absorption function and disease pathophysiological condition, the usual diet should be reasonably adjusted, from less to more, from thin to thick. In addition, viral enteritis may be secondary to lactase deficiency, can be changed to feed starchy food. It is recommended to go to the hospital in case of severe diarrhea to correct water and electrolyte disorders and avoid dehydration. When bacterial infection, can be under the guidance of the doctor oral treatment such as cefixime. It can also be treated with intestinal mucosal protectant montelukast powder powder. When acute diarrhea occurs, infants under six months of age can be supplemented with zinc 10mg per day for 10 to 14 days to help relieve the condition. It is recommended that four-month-old infants with diarrhea with egg-shaped stools seek prompt medical attention to avoid delays. The above medications should be used according to medical advice.