My daughter had reflux starting at 3 days old. It is very common!!! So many people think it's horrible to give reflux medication to a newborn/infant, but they are finding out that the percentage of babies with reflux is incredibly high. Most of the babies who are thought to have colic actually have reflux. Anyone who has had acid reflux themselves knows it is extremely painful. I have had it and cannot go with out taking medicine for it. There was no way I was going to let my daughter be in constant pain with constant crying. I wanted her to be happy and we wanted happy memories of our baby.
When she was a week old we started liquid zantac. Each dose was effective for about 4 hours and we could only give her 3 doses a day. That left 12 agonizng hours for all of us. By the time she was a month old we started her on Prevacid. It is an actual pill that I would break in half, drop into a syringe and then suck up water into the syringe. The pill would dissolve inside of the syringe so I could give it to her in liquid form once a day. That helped a lot, but still left about 4 hours of her feeling the pain. By the time she was 2 months, she was old enough to take 3/4 of a Prevacid pill every day and that worked like a charm. Every day she was PERFECTLY happy - all day. I tried taking her off of it at 9 months but the reflux came back and we had 3 days of crying and her not wanting to eat. When she was 12 months we started her on whole milk. After a month (when she was 13 months) we took her off the Prevacid again but she still had reflux, even with milk. By 15 months we were able to take her off if it and she has been perfectly healthy ever since.
Prior to giving her the medicine we too tried feeding her slow, burping her after every ounce, putting pillows under her mattress so the head of the mattress was at an incline and nothing worked. Reflux hurts! Please, for her sake and yours, just try the medication, and give it time to work. Try for at least 2 weeks to see if you notice a difference. But remember, you may have to adjust the dosage or switch to a different brand before you give up.
Aside from my daughter, 4 of my friends also have had babies with reflux in the last 2 years. My cousin was adament that there was no way her 3 month old could have acid reflux, but once she tried the medication, her daughter finally started taking the bottle, stopped vomiting, and stopped crying.
I hope this helps you! Good luck!