My baby pops sometimes green with yellow colored but sometimes it has little blood spot in it Why this?

A. blood spot potty have many reasons.. common cause of blood in the stools of infants is food allergies- Try to rule out allergent food substance and avoid give it. Occasionally, blood in the stool may be due to breastmilk oversupply. If mom has a cracked nipple or other bleeding, then baby may ingest some blood from mom (this is not harmful to baby), which may show up in baby’s stool. It may be lactose intollrance. better to consult paediatrician