The dr browns with or without vent? And why! We had the mam bottles but I was going crazy not having the 1 ounce marking. He doesn't like avent. The nuk have too fast of a flow and we just bought a dr browns options last night 🤞. He likes it so far but it's taking him about 40 min to drink 4 oz he is only 14 days old tonight but my question is it can be used with the vent or without. Please tell me the advantages. He's been very gassy and we already have switched his formula to enfamil gentle ease so now going thru the trial and error with bottles!