Baby bottles & sterilizer

So I have the 4 oz avent bottles and use the steam microwave sterilizer. But I just bought some 8 oz bottles and the sterilizer doesn't hold those so I was wondering if anyone knows a sterilizer that'll hold dr. Browns 8 oz bottles? And has anyone used dr. Browns bottles? My sis-in-law recommended to help with my baby and his colic and she said they work. Just wanted to see before I start using them.