Summarize the following:
While you work on building up your milk supply, you will need to continue feeding your baby formula. Do not cut back on the amount of formula you feed your baby until you begin relactating and your baby accepts it. Use bottles with slow flowing nipples. Liquid flows out of standard bottle nipples quickly, so your baby doesn't need to work very hard to eat. As a result, he or she can become more resistant to the idea of taking milk from the breast, which is more difficult to do. A supplemental system will deliver formula to your baby through a soft tube while your baby is nursing at the breast. As a result, your baby gets the food he or she needs while re-associating food with the breast instead of the bottle.  Many babies are willing to work with these supplemental systems because each suck is rewarded with a steady flow of formula. You will need to wear a container of formula around your neck on a cord. Thin, soft tubes leading from this container will be inserted into your baby's mouth as he or she is at your breast. When your baby sucks, formula from these tubes will flow into his or her mouth. Note that you can use these systems with both formula and breastmilk. It is strongly recommended that you receive help from a lactation consultant before using this device since it can be difficult to maneuver at first. If used incorrectly, it can even hurt the baby's mouth. Once your baby begins to breastfeed well, you can start cutting back on the amount of formula he or she receives.  Monitor your baby's weight during the entire process. If he or she is younger than four months, your baby must gain at least 1 oz (28 g) per day before you can safely cut back on formula supply. After your baby begins breastfeeding well, decrease the amount of formula by 1/2 fl oz (15 ml) in each bottle. Decrease by another 1/2 fl oz (15 ml) the following day. Repeat this pattern until you can eliminate or reduce supplemental formula feeding as much as possible without jeopardizing your baby's health.

Summary:
Supplement with formula. Consider using a supplemental nursing system. Gradually decrease the amount of formula.