What is baby feeding portion? This small bottle can hold up to 150ml. If baby is still drinking less then 150ml, no worries on changing the bottles. If you want to change, there will not be an issue as the volume will still be the same, and baby will usually be able to hold their bottle from 6mo onwards
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if ya sufficient for the milk. then I don't see why there is a need to change. Babies will learn to hold on their own. Dont worry too much about it.
no 4 months, next is 6 months for this brand.