Not all cases of blocked, stuffy nose needs treatment. Since it doesn't seem to be bothering your baby, you don't really have to do anything. As long as your baby is active, eats, drinks and breathes normally and show no major discomfort, reckon it's okay to wait it out. Just monitor her for the time being.
Besides the method you mentioned, if you are keen, you can place a cool-mist vaporizer or humidifier in your baby's room to add moisture to the air. My friends have tried this method and it does help with the blocked nose after a while.
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