Your baby is really very young to be having such a difficult problem. The most likely cause is enlarged adenoids. It is difficult to do anything active about this at her age, but she will benefit from twice daily use of infant nasal saline drops and the use of a probiotic such as Reuteri drops given daily to strengthen her immune system. If this problem shows no improvemnt by 9 months she should be seen by an ENT specialist.
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