What could be the reason if a baby has diarrhea after drinking formula milk?

A baby experiencing diarrhea after drinking formula may be due to malnutrition, bacterial or viral infection, or possibly a formula allergy. If you notice your baby has diarrhea after consuming formula, it is recommended to seek medical attention promptly for an examination to determine the cause and initiate timely treatment. If the diarrhea is caused by malnutrition, the baby should be provided with adequate nutrients. If it results from a bacterial or viral infection, medication should be taken under a doctor's guidance. If the cause is a formula allergy, it is advisable to immediately discontinue use and switch to a different formula.