Posted on the other question, but I dropped a load on Avent bottles. They were the rage here and I HAD to have them. Within a week, I'd packed them away and switched to the Playtex Disposable Drop-In Liner system. Not so great for the environment, but a total cinch to clean comparatively and the liners collapse as they eat (and you can squeeze the excess air out before they start) and it was a HUGE, HUGE help. I was so sick about spending that money on the Avent bottles, but more relieved that we'd found something that cut out a ton of gas for DD.
More detail: When we first brought DD home from the hospital, you could hear DD fart throughout our entire house. Not joking, she had that much gas and it was that loud when we used Avent bottles. How can that feel for a tiny little newborn? It stopped when we used the Playtex ones. Then at 12WO when she still wasn't sleeping, was a total crankpot we tried Nestle Good Starts. I was reluctant cuz I'd felt like we'd tried everything. What would this formula do? Within 24 hours, she was easier to put to sleep (still fussed but not hours like she had) and she slept longer than 20 minutes for the first time in her life (okay, after that hazy newborn period wore off). Then with 48 hours of switching to GS, she slept for over an hour. Again, the first time EVER in her life. I'm not kidding when I say that we were up with her 2-3 times an hour, all night long. She's still not a great sleeper but those early days...ick! Those two changes were a life-saver for me.