It is more likely that your baby is allergic to something in your breastmilk. The most likely suspects are cow's milk or egg or peanut that is entering your breastmilk in small traces if you are eating or dinking these foods. It would be a good idea to avoid drinking milk and eating eggs and avoid peanut and see if his nose blockage improves. You will need to take a calcium supplement if you stop drinking milk. If there is no change you can start drinking milk again but continue to avoid eggs.
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