One and a half year old baby poop after eating, may be related to indigestion, milk allergy, acute gastroenteritis and other factors, can be adjusted through the diet, medication and other ways to treat. 1. indigestion: due to individual differences, one and a half year old baby’s digestive system function and gastrointestinal tract peristalsis function development is not sound, at this time the baby will appear after eating diarrhea symptoms, this time to adjust the dietary structure in a timely manner, small meals, to light and easy to digest food-based. 2. Milk allergy: for milk protein allergy babies, will also appear the above phenomenon, this time under the guidance of the doctor to replace the moderately hydrolyzed milk powder or deeply hydrolyzed milk powder or amino acid milk powder. 3. Acute gastroenteritis: acute gastroenteritis is mostly caused by pathogenic microbial infections, if a one and a half year old baby’s diet is not hygienic, may carry a large number of pathogens into the body, and then appear the above symptoms, can be used under the guidance of the doctor montelukast, bifidobacteria triple live bacterial powder medicine therapy, pay attention to the daily diet hygiene. All of the above drugs should be used under the guidance of a doctor, avoid self-medication. If your baby has poop after eating, it is recommended to consult a doctor for evaluation and treatment.