How long yr bf lo poo after starting solid food?my lo now 7mo+ before start solid food he use to poo once 8-9days,but now he everyday poo after starting solid food,is it normal?

Yes! Dont worry about it. He is pooing more often due to the solid food. However how many times is he pooing in a day? If it is just more regular bowel movements i wouldnt worry too much. In fact at least its better then being constipated.