The bottle is leaking, you end up with lots of milk on the hands and the flow is too rapide.Le bottle is then unusable and for the price paid, it's very annoying to have to put it in the bin for simple valve .. .biensur they are not for sale!
Other worries, pieces inside peel off a few times when you feed your baby.
It is then necessary to stop everything and go dip your fingers into the milk to pick up the pieces!
Tommee Tippee baby bottles must improve.
Personally, I find it price to pay for it to end in the trash ...