It seems that your baby has a viral [probably RSV virus] chest infection which is known as bronchiolitis. This is not due to a post nasal drip as such but starts off as a cold. I am concerned to read here that he cannot drink his bottle because this means that he is very short of breath.I would normally recommend what you can do to treat your baby at home,but your baby seems to have quite a severe chest infection. It would be best to take him to be seen at an emergency paediatric clinic as soon as possible.
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