いつ哺乳瓶の乳首をレベルアップすればいいですか?

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どの乳首を使用すればよいですか、またその理由は何ですか?

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Dr Brown's: Dr Brown's ボトルに通気孔は必要ですか?

When to change baby's bottle nipples? #shorts #babybottles #nipple #formulafeeding #breastfeeding