If you need to increase your supply, the first thing you should start doing is either nursing or pumping every 2 hours around the clock. Remember that supply and demand are related. If you give your body a chance, it will catch up and make the amount of milk your baby is telling it to. For many moms, supplementing is the beginning of the end of breastfeeding. The next thing to try is eating a few foods that many moms find tend to help their supply.
Tuna fish is a good supply booster.
The most common dietary helper is oatmeal. Eat at least one bowl of oatmeal and day and you will hopefully see an increase in your supply. Dietary things to avoid include mint and lemon, both of which can hurt your supply. The next step is herbal supplements. The most popular herbal helper is fenugreek.