My baby was born 7.5 lbs she dropped to 6.8 and only started putting on weight when we topped up with a formula bottle. Her nappies were greenish. I am still nursing every feed and giving her a bottle. When ever i nurse her more frequently her nappies stop being yellow and it doesnt seem to settle her. Could there be something 'wrong' with my milk? Is there a way to make my milk more satisfactory for her?