Best bottle for colicky babies?

So my two month old starting out using Dr. Browns and we had so much trouble with leaking and slowest flow was too fast. We have tried MAMs but she didnt take to the nipple to well. We then just tried the parents choice brand and she really likes the nipple but now shes colicky. She seems to have gas build up and shes not burping well like she used to. Please let me know what your suggestions are for a good anti colic bottle?