my baby is 4 month old he is doing very dark greenish stool from last 2-3 days what does it mean ? is there anything to take him doctor ?and also when he have milk he vomit when he burp

A. color of poo doesn't matter more. Only if it's black or red you should be concerne and check with doocor. Else check for consistency. Normal type is fine. If consistency is watery or foamy or smelly then it is important to check with your doctor. Otherwise it's fine