A green newborn poop is normal as it is commonly observed in newborn babies.
When a baby is born, his digestive system is still developing and therefore one may observe various changes like the green newborn poop.
This is a major issue for most parents who consult the doctor for advice at even a slightest change in the color of green newborn poop.
During the first few days after birth the baby passes dark and sticky poop known as the meconium.
The green newborn poop is normal as it only reflects the changes in the digestive system.
There are cases where the newborn breastfeeding baby may not pass bowels for days.
This is not matter of concern as the newborn baby must be digesting most of the breast milk and there may be very little residue left.
Thus, after a few days when the fecal matter is collected, the baby may pass bowel movement.
This bowel movement may be yellow to brown or it may be green newborn baby poop.
The various digestive juices may stay n the color of the faces and thus there may be instances with green baby poop.
One does not need to take the baby to the doctor as the green color of the baby poop is normal.
For more information, check this link: Baby poop chart