May sound stupid but how do you know when to go up a teat size on bottles? Currently using the mam ones!
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I've just sized up to teat 2 mam and my LO is 18 weeks old
She was taking ages to finish bottle and chewing teat

Just try the bigger teat once in a holder and see how your LO does with it. If it’s too big they will struggle a bit then just do drop back down, no biggie x