It happened to me! I am using pigeon softouch. It only happened when I newly switch to size LL! I found it super odd and after awhile I realised why she was taking so long to finish her milk is because it went flat. I had to change teat cause there was a tear and subsequently it never happened again! I thought it was a vent issue so I kept pressing the teat to “release” air whenever I made milk but what only stopped was when I changed to a new one 🤷🏻♀️
maybe it's a defective teat, change to a new one and make sure always open the valve before each feed, if still happens then maybe time to size up
it sounds like air pressure build up inside the bottle. Do press on the opening on the teat to release the pressure, or open the lid to decompress
Pigeon tend to have that issue. My sister’s baby also the teat also became flat i think because the bottle teat is very very soft
Make sure the hole is facing up! It’s the air pressure
Sha M