"Is the baby usually content? Is the baby drinking well from the breast (see the videos at our website that show babies drinking well from the breast or not)? Is the baby gaining weight well? If the answer to all these questions is "yes" then don't worry about the colour of the poops, don't go on any special diets, don't feed the baby on just one breast at a feeding. Feed the baby normally, that is "Finish one side and offer the second side". If the baby doesn't want the second breast, fine. But offer it. Do not do "block feeding"."
Note that keeping the baby on just one breast is not the answer. If the baby is not actually drinking at the breast, he is not getting hindmilk. I wish we had never heard of hindmilk. True, milk increases in fat as the baby continues to get milk from the breast (but not if he's sucking without drinking). Usually the notion of hindmilk causes confusion and results in mothers getting advice that doesn't make sense.
I am often tempted to say also, "put on sunglasses, so you don't see the colour of the bowel movements", but I don't.
If the baby is not usually content, if the baby is not drinking well, if the baby is not gaining weight well, then the problem is not the colour of the bowel movements.
What causes the bowel movements to be green? Rapid transit through the baby's gut. That's all!