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A rattling noise in a 5-month-old baby could be caused by several factors, including nasal congestion or a mild respiratory infection, which can lead to mucus in the airways. It may also be due to normal developmental sounds as they learn to vocalize and explore their voice. However, if the noise persists for over three weeks or is accompanied by other symptoms like difficulty breathing, fever, or irritability, it's important to consult a pediatrician for a thorough evaluation.

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3mo ago

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