My 7 weeks old baby has a poop like avocado in color im bottlefeeding breastmilk. is this normal? what should i do??

Not a problem: the color of poop has more to do with what you are feeding them. -so your diet

Pretty common: The greenish color in stool is the breakdown product of the bile when it has not been in the gut long enough to go through a change to yellowish or brown. It is normal as is the loose consistency. Some digested material will take on a darker tint than others & the germs in the gut will also impact the final product. I'd ignore the whole issue.