FTM! Baby is 5 weeks, bottle fed with formula and breastmilk. We have been using Avent natural since birth and recently increased the flow rate nipple from the 0 to the 1. With the zero, she recently was getting irritated when feeding and would take about 30-40 mins for a bottle..so we assumed it was now too slow, so we started using the stage 1. However we now notice She finishes the bottle within 10 minutes and is sometimes coughing/choking. Thinking it’s too fast?? I had a dr browns bottle I tried, and she didn’t cough with that. I’m wondering if it’s worth it to buy all new bottles of dr brown? Has anyone had these issues? Should I switch?