What is the reason for the child having green poop twice with a slightly fishy odor?

Patient's question:

Postpartum at 50 days, due to diarrhea and fever, the doctor recommended stopping breastfeeding. During the two days of not breastfeeding, the diarrhea caused dehydration, and the milk supply was very low. After resuming breastfeeding, the child was given a mix of breast milk and formula, trying to prioritize breast milk as much as possible, only supplementing with formula when needed. The child has had two episodes of green stools, which had a slightly fishy odor, but the child is doing well. I would like to ask what could be causing this? The milk supply is insufficient, and the breasts feel shriveled. How can I increase milk production?

Doctor's answer:

Common causes of green bowel movements in babies:
1. Under conditions such as catching a cold, the baby may experience spitting up and green bowel movements again;
2. When the baby is hungry, the intestines move too quickly, causing bilirubin in the intestines to not be fully converted and to be excreted in the stool, which may turn the stool green;
3. Babies who consume iron-fortified formula or take iron supplements may have green or yellow-green stools if they cannot fully digest the iron;
4. When babies first start eating green vegetables, their stools often turn green.

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