Teat keeps collapsing- what does it mean?

[Princesspowersparkle]

Hi sll, just intro my DD to bottle with EBM but on a couple of feeds the teat keeps going in. What does this mean? FYI: DD is 4 mths and I'm using Tommee Tippee 3+ mth teats.

TIA
xx

if you twist it slightly to release the suction, it will fill back up with milk [it makes a funny noise]

If you're using the Closer to Nature teats check the little valve isn't stuck together after cleaning and before sterilising. I had the same prob and the valve just need opening up again.