Please read this book!!!!

Breastfeeding Made Simple

And speak to a lactation consultant. I don't know your particular story but the more baby drinks from the bottle the more they want the bottle. And that will absolutely have an affect on your supply. Stress, lack of hydration, or proper nutrition can affect your milk also. Hydrate the very best you can, Gatorade always helped me on low supply day, and get the baby to your breast as frequently as possible. Let him nurse as much as you can handle. The more he nurses the more your supply will build up. Best for wishes dear!!! And do all you can to refrain from the bottle.

BUT, remember, no matter what in the end THE ONLY thing that matters is having a healthy mommy and baby. If you try everything to make breastfeeding work and it just doesn't, having a healthy baby is the most important aspect of this whole thing. I only was able to nurse exclusively with my first child for 2 months and the had to pump exclusively for 5 months. She received breast milk for 7 months only and unfortunately due to extenuating health circumstances she also got formula. My second DD never took a bottle and nursed for 20 months. She would have gone longer if I hadn't made the decision to stop. Every baby we have brings a new experience. Both of my girls are healthy and my relationship doesn't suffer any. Many hugs and well wishes mama!!!