Mature milk.

I know it can take up to 5days sometimes for your milk to kick in. But my baby is eating more then I am pumping. I am also boob feeding but also pumping for if I have to go somewhere or if her grandparents watch her. Also daddy loves feeding her so yeah. But I'm still only getting colostrum out. I get an ounce from each breast if I'm lucky. And she eats that in one bottle feeding so I'm not getting enough and plus I really want to start my back supply of milk! So does anyone know tricks that can help my milk come in??