Hey Mama's, I need some advice. I nurse and also bottlefeed my 3 week old son, however it seems the bottles I have been using give him gas, hiccups and of course cause him to have spit up. I was using the MAM bottles but for some reason the ventilation system isn't working in them or it doesn't seem to. I'm trying Dr Browns and they don't really seem to work, however I've only used them once. I have an Advent bottle that seems like it works? Unsure. But what bottles do y'all swear by? I literally can hear him sucking down air when he feeds and I try the pace feeding and burping basically every half oz.