I hv changed the bottle to NUK instead of pigeon, but I think it doesn't affect whether the baby will drink or not. However, it's true though that BB doesn't intake as much"air". My BB now changed to JAPAN milk powder, and the first day he tried it, he drunk 7oz. at one serving, but today he go back to 4 oz. and fall asleep, and finish the rest when he woke up. He likes breastfeeding though, but I'm giving to him at morning and night.
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